If we consider it in relation to the X-axis, the point X would be the one in the middle. For this reason, the coordinates of Z can be calculated from calculating any displacement from X to Y and adding it to W, or from X to W and adding it to the coordinate of Y. It happens because the opposite sides of a rhombus have the same length and orientation, as follows:
Calculating the displacement from X to Y, which is

Adding it to the W coordinate, we have:

From the solution we developed above, we are able to conclude that the answer to the present question is:
Z = ( 1, 3)