Balancing Moments: Solving for Distance in a Force System Resultant

[overside]

Homework Statement

http://i.imgur.com/NcI8y.png?1

So i did A and got the answer of Fr to be {-129i, -221j} N
and the Mra = -354k Nm

which are right from the answer key

so now about part b I think I should balance all moment at the G point about z axis or something like that thus according to

M = Fd

shouldn't I be able to get the x & y distances by dividing Mr by Fr to yield d since moments just have to balance out
so i did
354/129 = y = 2.74
254/221 = x = 1.60
which aren't the right answers D: (supposed to be G(+2.23, + 1.07, 3)

heeelp D:

 

[Simon Bridge]

shouldn't I be able to get the x & y distances by dividing Mr by Fr to yield d since moments just have to balance out

Well if Mr=d.Fr then yes. Is that the relationship?