Incidentally this whole bent stick thing is a modelers adaptation of reality.
To arrive at an easement length, consider taking one half of any curve's radius and center that over the X spot.
Half of a 74" radius is 37". Which equals L. Half of L is 18.5".
Stop the fixed curve 18.5 inches before X and run the easement 18.5" into the tangent after X and bend the stick.
Now here is where many mess up. As I mentioned in an earlier post above, I found it is very important to make sure the marking side of the bent stick is at the mid point of the X dimension. In your case, using my wet thumb, 3/8".
I have had to correct many curves where bent sticks were used. Bent sticks frequently yield exaggerated center lines near their ends.
Great expressions of easements are far more attractive than any tangent lost imo.
My own RR has less than 5% tangent track.