The missing step in Amy's process of bisecting a line segment is as follows:

4. Repeat step 1 by placing the compass at the other end of the line segment and draw similar arcs that intersect the previous ones.

This step ensures that the two sets of arcs intersect, allowing you to properly draw the perpendicular bisector of the segment in step 5.

Would you like further details or clarifications?

Here are some related questions:

1. Why do the arcs need to be slightly longer than half the line segment?
2. How does the intersection of the arcs help in bisecting the line?
3. What is the geometric significance of the bisected line?
4. Can this method be used to bisect angles as well?
5. How could you bisect a line segment without using a compass?

Tip: Always double-check that the compass is not too wide or too narrow to ensure the arcs intersect correctly when bisecting a segment.