You're right by one thing: Yes, I did miss the reference in E2 to G2



But using my piece of paper a second time it says:
G2 = 1/((1/1.2-0.15-M2)/(B2+C2+D2))

Now the question remains if I got it wrong at some point. I don't think so, but it always makes me suspicious if somebody else says "it can't be done" assuming he/she tried on his/her own, and therefore knows what he/she is talking about. So please just check if the formula is doing allright, otherwise you probably will have to do with GoalSeek.

Hello,

Thanks for your response.

That does not bring up the right answer on all cells, hence I cannot use that. I have found another method.

Thanks anyway.