The fraction given is $\frac{437}{999}$.

To convert this fraction into its decimal form, we perform the division:

$\frac{437}{999} \approx 0.437437437\ldots$

This is a repeating decimal, which can be written as $0.\overline{437}$.

In conclusion, $\frac{437}{999}$ is equivalent to the repeating decimal $0.\overline{437}$.