I know I can't profitable call a 3bet with a PP if you play it only for set value against 1 opponent who 3bets you something above 10BB. (given the 5/10 rule)

But what I wonder, if someone bets 4xBB, u call and someone 3bets and the original raiser calls. Both have 100BB. Can I profitable call for set value only?
If not, from how many persons can I call, if ever?

what is the 5/10 rule?

Odds to hit a set on the flop are 2:19 (2/17). That should help.

If I understand you correctly you say all three players start with 100bb. Payer 1 raises it 4xbb and you call. Next player 3 bets? Is this a typical 3x the original raise? If so then he just bet 12bb. If player 1 calls the raise then the pot will be ~28bb and you need to put in 8. You're already getting about 3.5:1 so you only need to make up another 3.5-4. The pot will be 36bb and everyone has 88bb left. A typical bet on the flop will be well above the 3-4 you needed. A bet on the flop probably pot commits a player too.

And you might be able to call that 10bb raise. Depends on stack sizes and if that opponent will stack off enough if you hit your set. Typical online stacks aren't deep enough.