Since the number 866 is not divisible by 3, this is impossible. The three numbers which differ by 1 and add to make 866 are:
287.6 recurring (that is, 287.6666...)
288.6 recurring
289.6 recurring
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This is no set of three consecutive numbers that when multiplied equal 387.
695
2259 + 2261 + 2263
21
12 + 14 + 16 = 42