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See the wiki page https://en.wikipedia.org/wiki/Factorial_number_system for information on the Factorial Number System.
First, we write the base-10 number 60 in the Factorial number system. We calculate
$60 \div 1 = 60$, remainder 0
$60 \div 2 = 30$, remainder 0
$30 \div 3 = 10$, remainder 0
$10 \div 4 = 2$, remainder 2
$2 \div 5 = 0$, remainder 2
This gives $60_{10} = 2:2:0:0:0_!$
Thus, the 60th permutation of 1, 2, 3, 4, 5 in lexicographic order is $34125$
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