Question 1038712
Look at the differences between successive numbers,
{{{100-96=4}}}
{{{96-104=-8}}}
{{{104-88=16}}}
{{{88-120=-32}}}
{{{120-56=64}}}
So then the next difference would be {{{(-2)(64)=-128}}}
{{{56-X=-128}}}
{{{X=56+128}}}
{{{X=184}}}