Multiple Marker Math Multi Multi-Cache

This is a multi cache, where the first few stages are virtual stages that require you to locate some numbers, and then perform some simple math to compute the coordinates of the final.

At the posted coordinates, locate a benchmark style marker.   On this marker are three numbers, call them abc.

Markers 2 and 3 can be done in any order.   Both markers are also benchmark style, and are just a step or two off from the west side of the pathway.

Marker 2 is located north of the posted coordinates.  Follow the pathway north until your distance from the posted coordinates is (abc * 1.5898) meters.   On this marker are three numbers, call them def.

Marker 3 is located south of the posted coordinates.  Follow the pathway south (across the road) until your distance from the posted coordinates is (abc * 1.1729) meters.   On this marker are three numbers, call them ghi.

The final coordinates are given by computing the following:

N 30 (b - a)(g + d).(h + f - d)(i - c)(c - e)
W 97 (i - h)(f - e).(b - h - g)(c - h)(b + h)

Don't forget to bring a writing utensil.