Replace the force system acting on the frame by an equivalent resultant force and specify where the resultant’s line of action intersects member AB, measured from point A.
Given:
{ F }_{ 1 } = 36 Ib
{ F }_{ 2 } = 20 Ib
{ F }_{ 3 } = 25 Ib
\theta = 30 deg
a = 2 ft
b = 4 ft
c = 3 ft
d = 2 ft