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### Best Answer Gina145 says

This proved a lot easier to solve than I thought it would be.

A has to be 1, since anything else would mean that at least two of the numbers would be seven digit numbers. If A=1, then F=7, since that is the only number whose product when multiplied by 3 would end in a 1. Multiplying 7 by 2,4,5 and 6 gives one the remaining numbers: B=4, D=8, E=5, C=2.

The answer is X=142857

Very nice work. 142857 is one of my favorite numbers.