Replace the loading on the frame by a single resultant force. Specify where its line of action

Question:

Replace the loading on the frame by a single resultant force. Specify where its line of action intersects member CD, measured from end C.

Given:
F1 = 500 N a = 3 m
F2 = 300 N b = 2 m
c = 1 m
F3 = 250 N
d = 2 m
M = 400 N ∙ m e = 3 m
θ = 60 deg f = 3
g = 4