The coordinates of the points in the original quadrilateral are:
A (0,0)
B (0,5)
C (6,5)
D (6,0)
After a dilation with center (0,0) and scale factor 4, the coordinates become:
A' (0,0) (unchanged)
B' (0,20) (multiplied y-coordinate by 4)
C' (24,20) (multiplied x and y-coordinates by 4)
D' (24,0) (multiplied x-coordinate by 4)
Therefore, the coordinates of point D in the dilated quadrilateral are (24,0).