We are given the equation $7123 \div x = 712.3$ and asked to find the value of $x$.

1. Problem Description

We are given the equation $7123 \div x = 712.3$ and asked to find the value of $x$.

2. Solution Steps

Let $x$ be the missing number. Then we have the equation $7123 \div x = 712.3$.

To find $x$, we can multiply both sides of the equation by $x$ to get $7123 = 712.3x$.

Then, divide both sides by $712.3$ to isolate $x$:

$x = \frac{7123}{712.3}$

$x = \frac{7123}{712.3} \times \frac{10}{10} = \frac{71230}{7123} = 10$

3. Final Answer

10