The smallest possibility for the larger number is $2457.2=4914$. That mean the first digit can only be $5$ or $7$Because $2457.4=9828>7542>2457.3$ ($7542$ the greatest numer possible) so the dividend is no more than $3$
$\Rightarrow 7$ is impossible for the last digit.
Try these cases :
$5274 \hspace{0,8cm} 5472 \hspace{0,8cm} 5742 \hspace{0,8cm} 5724 \hspace{0,8cm} 7245 \hspace{0,8cm} 7254 \hspace{0,8cm} 7452 \hspace{0,8cm} 7425 \hspace{0,8cm} 7524 \hspace{0,8cm} 7542$
We can easily find ${7425=3.2475}$
So $\color{red}{7425}$ is the answer