1:13:28:5:21:13 () () Press

1:13:28:5:21:13 () () Press

1/1 2/3 5/8 13/21 (34/55) (89/144) (233/377)
Rule: the numerator of the previous fraction plus the denominator gets the numerator of the next fraction, the denominator of the previous fraction plus the numerator of the current fraction gets the denominator of the current fraction