Extruding/Lofting Past Profiles
Sorry, I can't open your dxf-file. And from the jpg file I can't see what you have and what you want to achive. Perhaps you can post a dwg please.
An additional hint: you can attach the files directly here in your postings.
Jürgen Palme
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I assume you want to project the back end of the loft to the yellow plane.
Examining the shape I exploded the solid, removed a couple of surfaces, and changed the color of the lofted surface to cyan and green and the back surface to blue as you can see here.
Setting a UCS perpendicular to the direction of the loft (UCS ZA) by picking points on the edge of the cyan surface and then viewing the plan view of the new UCS yields this view.
The fact that the back and front surfaces do not line up indicates that the lofted surface is more likely conical than cylindrical. Was that the intent?
Since the radius of curvature is decreasing as you go from front to back (red profile to blue profile) you need to establish an additional point on the yellow plane in addition to the two tangent points to determine the radius of curvature of the profile on the yellow plane.
In the following image the white lines are rays extended to the yellow plane and the magenta curve is the profile for the extended loft.
