Algebra

104% is aso 104/100. We can form an equation.

$\frac{104}{100}x=598\\ 104x=59800\\ x=575$

Therefore x=575.

$104\% \cdot x = 598$, where $x$ will be our answer. We can express $104\%$ as a fraction out of $100$. This is equal to $\frac{104}{100} = \frac{26}{25}$. Therefore, $\frac{26}{25} \cdot x = 598$. We multiply each side by $25$ to get rid of the fraction on the left hand side. Therefore, $26 \cdot x = 598 \cdot 25$. Now, we will divide each side by $26$, so we can isolate $x$. 

$x = \frac{598 \cdot 25}{26}$

Now it's simple arithmetic. This yields the answer of $\boxed{575}$

1.04 x = 598

x = 598/1.04 = 575