The centre of a group of points at arbitrary locations in 2D or 3D space is usually referred to as the [centroid][1]. This is computed by averaging the location of the points in each coordinate (x, y, and z).
Assuming you have `N` points (4 in your case) stored as `Vector3`s, just add them all together (vectors are added component-wise in Unity, as they should be) and divide the result by `N` to obtain the coordinates of the centroid point.
[1]: http://en.wikipedia.org/wiki/Centroid
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