By rules as written their save would be +14.
From the PRD
"Multiclassing
Instead of gaining the abilities granted by the next level in your character's current class, he can instead gain the 1st-level abilities of a new class, adding all of those abilities to his existing ones. This is known as “multiclassing.”
For example, let's say a 5th-level fighter decides to dabble in the arcane arts, and adds one level of wizard when he advances to 6th level. Such a character would have the powers and abilities of both a 5th-level fighter and a 1st-level wizard, but would still be considered a 6th-level character. (His class levels would be 5th and 1st, but his total character level is 6th.) He keeps all of his bonus feats gained from 5 levels of fighter, but can now also cast 1st-level spells and picks an arcane school. He adds all of the hit points, base attack bonuses, and saving throw bonuses from a 1st-level wizard on top of those gained from being a 5th-level fighter.
"
Emphasis mine.
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This was the reason PF changed the save progression for Prestige Classes. You would not be unreasonable adopting that progression for the second class in multiclass characters.
Personally, if the second class has the same save progression as the first (i.e. Good Fort for both classes) I have them continue to progress as if they were singleclassed. Thus a Fighter2/Barbarian2 has +4/+1/+1 instead of +6/+0/+0.
Another option is the fractional saves/bab method from Unearthed Arcana, which is a variant of going by progression.
Basically, a good save starts at 2,5 and increases by 0,5 per level, while a poor save starts at 0,33 and increases by 0,33 per level. So, just add all good progression levels together, and all poor progression levels together, and then round down the total.
For attacks, a good BAB starts at 1 and increases by 1 per level, a medium BAB starts at 0,75 and increases by 0,75 per level, and a poor BAB starts at 0,5 and increases by 0,5 per level.
This option makes characters more balanced (for instance, you won't have a high-level character with 0 BAB or 0 in a save, and you also won't have a high-level character with 20 in a save).
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@TriOmegaZero:
Thats sounds nice for the Fighter2/barbarian2... though, what would you do for a Fighter2/Monk2 about will/Reflex saves?
+4/+3/+3
Adding Poor and Good Saves together is never a problem. It's when you have five classes with the same poor save and have a +0 at 10th level instead of a +3, or the same good save and have a +15 instead of a +7. Talk about screwing the RNG.
Another option is the fractional saves/bab method from Unearthed Arcana, which is a variant of going by progression.
That is effectively what I do, without doing the math.