Hi guys, I know this is kind of easy maths and I did this many times but I checked my 4betting range today (for the first time in a long time) and now I have doubt about some of my calculations, and I don't want to be wrong about this given how often the spot happens

Let's say we're in CO and BU 3bets us
CO opens 2.5, BU 3bets 7.5, CO 4bets 19, BU shove
We want to prevent BU from shoving light (with 32% equity against our 4b/calling range) and winning money, we want to make BU EV0 in this spot.
(I chose 32% equity because it's the equity of a pocket pair against JJ+ AK)

When CO folds : BU wins 7.5+19+1.5 = +28
When CO calls : BU wins 200 32% of time and lose 100 68% of time = -36

So BU is risking 36 to win 28 : 36/(28+36) = 56%

So we have to 4b/call 44% to make BU indifferent between shoving TT and folding, right ?

Thx for taking the time to answer me !