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When it get to the button, the pot is already 720 (15+30+135+270+270 ignoring antes). So a pot sized 4-bet would be to 1980 ([720+270]X2). Since this is 2/3 of button’s stack, an all-in jam is reasonable with their entire 4-betting range.
So I think that both the 4-bettor’s and the initial 3-bettor’s ranges are uncapped and can include AA and KK.
You didn’t mention your stack size but I’m assuming you cover the 2900 jam. You already put in 270 so its 2630 to call.
Pot is 2900+2700+135+270+45 = 6050.
Equity needed to make a break even call is 2630/(6050+2630) = 30.2%
Facing 2 players with ranges of JJ+, AKs, AKo, your equity with AKs is 24.1%
So given these ranges, it’s a clear fold.
Playing around with the ranges, I ran the equities again assuming that the 4-bettor would bet smaller with AA and KK and gave the all-in range to include weaker hands like AQ & TT. I further added TT to the calling range of the initial 3-bettor.
With these adjusted ranges, AKs has an equity of 30% for a break even call.
Since I don’t think many players are 4-bet jamming this light or calling off this light, my conclusion is that a fold is best.
