LarsonET$55\mathrm{.}4\mathrm{.}053.$

Find the value$($s$)$ of $c$ guaranteed by the Mean Value Theorem for Integrals for the function over the given interval. $($Round your answer to four decimal places. Enter your answers as a comma$-$separated list.$)$

$f(x)=3\sqrt[\phantom{2}]{x},[4,9]$