Each number is multiplied by an incrementing value. 107 is multiplied by 2, 214 is multiplied by 3, 642 is multiplied by 4 and so on.
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77,040 because 107 x 2 = 214 214 x 3 = 642 642 x 4 = 2568 2568 x 5 = 12840 12840 x 6 = 77040
77040
It could be: 2*214 = 428
77 040 539 280 4 314 240 38 828 160 388 281 600
The four multiples of 107 are 107, 214, 321, and 428.