Two-nonparallel lines are drawn on a sheet f paper so that their theoretical intersectionn is somewhere off the paper. Through a point, P, selected on the part of the paper between the lines, construct the line that would, when sufficiently extended, pass through the intersection of the given lines.

Any guidance as to where to begin (I'm guessing triangles or collinear points need to be drawn before Desargues's Theorem or its converse can be utilized) would be appreciated!