The amount of money made by the restaurant. Given: $545 earned by selling 110 hamburgers.

Calculation:
Let the amount of money made by the restaurant is x.
The proportion can be written as:
${\displaystyle \frac{545}{110}=\frac{x}{53}}$
The ratios can be simplified further by doing cross product:
${\displaystyle \frac{545}{110}=\frac{x}{53}}$
${\displaystyle 545\left(53\right)=110\left(x\right)}$
${\displaystyle 110x=28885}$
${\displaystyle \frac{110x}{110}=\frac{28885}{110}}$
${\displaystyle x=262.590}$
${\displaystyle x\approx 262bur\ge rs}$

Step 1
For the equation
${\displaystyle \frac{545}{110}=\frac{x}{53}}$
The cross product is
${\displaystyle 545\times 53=110\times x}$
Solving for x
${\displaystyle x=\frac{545\times 53}{110}}$
and reducing
${\displaystyle x=262.59090909091}$

Step 1
$\frac{545}{110}=\frac{x}{53}$
Multiply both sides of the equation by 5830, the least common multiple of 110, 53
$53\times 545=110x$
Multiply 53 and 545 to get 28885.
$28885=110x$
Swap sides so that all variable terms are on the left hand side.
$110x=28885$
Divide both sides by 110.
$x=\frac{28885}{110}$
Reduce the fraction $\frac{28885}{110}$ to lowest terms by extracting and canceling out 5.
$x=\frac{5777}{22}$