Replace the force system by an equivalent resultant force and couple moment at point P.
Given:
{ F }_{ 1 } = 60 Ib\quad a = 2 ft
{ F }_{ 2 } = 85 Ib\quad b = 3 ft
{ F }_{ 3 } = 25 Ib\quad c = 6 ft
\theta = 45 deg\quad d = 4 ft
e = 3\quad \quad \quad f = 4