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yes, another hw problem...

Been trying this problem for two days now, any one that can lend some advice it would be much appreciated.

We have a "force plate" Which is being stepped on. The sides of the force plate are .75m. Their are sensors at each corner which measure the three dimensional force applied at that corner.

F1 = 14i+17j+155k N at (.75,0,0) m
F2 = 23i+26j+166k N at (.75,.75,0) m
F3 = 22i+25j+178k N at (0,.75,0) m
F4 = 16i+14j+182k N at (0,0,0) m

We need to find torque on Z-axis(easy IMO), and the force at the place where he stepped along with the position vector of that point. so far I found the torques cause by F1..F4 about each axis.
 
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