What is the wingtip station number on a Boeing 747?
For the wing tip station , just divide the wingspan by two and multiply by 12.  The stations are in inches.  For a 747 with a 195' 8" wing span, the tip station is 195.66 divided by 2, times 12 = 1173.96, so the tip will be Station 1174.

For X and Z you need to know where the datum point is longitudinally and for the X axis, and what the waterline is that defines the Z axis.  Waterline is often the cabin floor.  X datum on a jet is often the forward pressure bulkhead surface.