We'll determine the resultant force from the summation of Fx and Fy components.
Fx = Fcosθ
ΣFx = 250cosθ - 300 - 500cosθ = 250(4/5) - 300 - 500cos30 = -533N
Fy = Fsinθ
Replace the force system acting on the post by a resultant force and specify where its line of action intersects the post AB measured from point A.
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