Parallelogram: Both sides are of similar length and are parallel to one another.
Since the length of both sides need to be the same,
Length of one side:
3-(-4) = 7
Length of other side = 7
y coordinate of fourth vertex = -2+7 = 5
Since both lines are parallel, the x coordinate of the fourth vertex is similar to the point below it, which is -4
Therefore, the coordinate of the fourth vertex is (-4, 5)