Question 663819
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Hi,
The idea is consecutive numbers algebraically start with x and go Up one for each consecutive other. 
(regardless of the sizes of the numbers) That is to say the fact they are 3-digit numbers has nothing to do with the Set UP
 4 consecutive numbers:{{{highlight(x)}}},{{{highlight(x+1)}}},{{{highlight(x+2)}}},{{{highlight(x+3)}}}
Question states*** 
 x + (x+1) + (x+2) + (x+3) = 866
      4x + 6 = 866
         4x = 860
          x = 215
the 4 numbers are 215, 216, 217, 218
and...
{{{215+ 216+ 217+ 218}}}= 866