How far from a $0\mathrm{.}8$C point charge does the potential have a value of $126$ V$?$

Use a value of$9\mathrm{.}00$x$109$ N$.$m$2/$C$2$for Coulomb's constant,$$k$.$

Write your answer in the units of meter $($m$)$ to the first decimal place, e$.$g$.26\mathrm{.}3$

Do not include units in your answer;$$just write the numerical value.$$