Given:
The forces;
A=43.3 N east
B=46.3 N north
C=70.7 N west
D=66.7 N south
To find:
The direction of the net force.
Step-by-step explanation:
Let us assume that the east is the positive x-axis and the north is the positive y-axis.
The forces in the vector forms can be written as,

Where i and j are the unit vectors along the x and y axes respectively.
The vector sum of the forces is,

On substituting the known values,

The direction of a vector is,

Final answer:
Thus the direction of the resultant force is 36.7° in counter-clockwise from the x-axis.