The LCM of 56, 30, 108, and 120 is:

56 = $ 2^3 \times 7$
30 = $ 2 \times 3 \times 5$
108 = $ 2^2 \times 3^3$
120 = $ 2^3 \times 3 \times 5$
Highest powers:
$2^3,; 3^3, 5, 7$
LCM = $ 2^3 \times 3^3 \times 5 \times 7$
= $ 8 \times 27 \times 5 \times 7$
Answer = 7560