Given any number it is easy to find a rule based on a polynomial of order 4 such that the four numbers are as listed in the question and the next is the given number. There are also non-polynomial solutions.
The polynomial with the lowest order for this sequence is
Un = -3n2 + 14n + 64 for n = 1, 2, 3, ...
and, accordingly, the next number is 59.
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75
54 / 0.72 = 75. Therefore, the number that 54 is 72 percent of is equal to 75.
next would be 71 and then after it would be 63.
72
75% of 72 = 72*75/100 = 54