Question 1091282
your answer is correct
.
.
Any term we can find using the Ruler {{{b[n]=b[1]*r^(n-1)}}} 
For the fourth term: {{{b[4]=b[1]*r^3}}}
{{{b[1]=2}}}, {{{r=3}}}
{{{b[4]=2*3^3=2*27=54}}}
Answer: 54