\[x - первое\ число;\]
\[(x + 1) - второе\ число;\]
\[(x + 2) - третье\ число.\]
\[x + x + 1 + x + 2 = 102\]
\[3x + 3 = 102\]
\[3x = 99\]
\[x = 33.\]
\[x + 1 = 34.\]
\[x + 2 = 35.\]
\[Ответ:\ \ 33;34;35.\ \]