What is the Height at which the Resultant of Three Forces Acts?

[J-dizzal]

Homework Statement

Determine the height h above the base B at which the resultant of the three forces acts.

Homework Equations

M=Fd

The Attempt at a Solution

not sure how to get the height here. thanks
im assuming the distance they are asking is less than 72 in. but I am not sure how to find that.
I guess i would need to put my forces in a formula where d is not the variable.[/B]

 

[Nathanael]

-31,680 in.lbs can't be right. Check your addition.

 

[J-dizzal]

sweet thanks Nathanael!