Replace the force system acting on the frame by an equivalent resultant force and specify where the

Question:

Replace the force system acting on the frame by an equivalent resultant force and specify where the resultant's line of action intersects member BC, measured from point B.

Given:
F1 = 35 lb
F2 = 20 lb
F3 = 25 lb
θ = 30 deg
a = 2 ft
b = 4 ft
c = 3 ft
d = 2 ft

B C