**Known values:**

Coordinates *A (E _{A}, N_{A})*

*, B (E*_{B}, N_{B}), C (E_{C}, N_{C}), D (E_{D}, N_{D})i.e.

*A E 250 N 530*

*B E 510 N 1130*

*C E 1390 N 1180*

*D E 1760 N 150*

**Solution:** Coordinates of intersection point *X (E _{X}, N_{X})*

The equation of line AC:

i.e.

thus

Similarly, the equation of line BD:

i.e.

thus

Subtracting (1) from (2),

Substituting in equation (1),