292. Find the number which, when multiplied by 5, gives as much as its square, added to four.
292. $x^{2}+4=5 x$

$$
\text { according to Paciolo } x=\sqrt{\left(\frac{5}{2}\right)^{2}-4}+\frac{5}{2} ; x_{1}=4 ; x_{2}=1
$$