The program results are:
MEAN AERODYNAMIC CHORD DEFINED BY ex2.nml # y xle c xte 1 200.00000 100.00000 1000.00000 1100.00000 2 400.00000 500.00000 600.00000 1100.00000 3 1000.00000 900.00000 200.00000 1100.00000 area of wing= 400000.0000 length of MAC= 586.6667 y of MAC= 506.6667 xle of MAC= 513.3333 xte of MAC= 1100.0000 x of c/4 of MAC= 660.0000
The MAC of the right wing is shown along with its quarter-chord point. Observe that it is not actually a chord of this planform. It matches at the trailing edge, but not at the leading edge.