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Lynda
It should measure 54 1/2". Mine measured 54 1/4". I measured in a few other spots and the measurement was consistently 54 1/4".
If your measurements are not consistent, average the measurements together and cut your strips accordingly. Cut 2 border strips to the size that your quilt top measured. Fold your top into fourths and mark with pins. Fold Border 1 into fourths and mark with pins. Pin Border 1 to quilt top, matching pins. Stitch seam with Border 1 on top. Work on one quarter at a time, leaving pins in position until you get to them. Press seams towards outer edge of quilt top. Measure quilt from side to side. It should measure 46 1/2". Adjust your measurement if necessary. Match and pin quarters, stitch and press as before.
Outer Border
Measure and cut side borders as before. Match and pin quarter sections. If you cut your outer border strips on the lengthwise grain as pattern suggests you will probably need to ease your quilt top to fit the border. There is a lot of stretch in the outer edges of the top, since it is all crosswise grain. Mark and pin quarter sections accurately. Stitch with the quilt top closest to the sewing machine bed. The feed dogs will help ease any fullness into the border. Keep pins in place until you get to them. Press seam to outer edge of quilt top. Repeat for top and bottom borders. Yeah--a completed quilt top!