Solve the Inequality: Finding the Missing Number in 5,181 < ???9 < 6,001

To solve this problem, we need to find a number in the form of $???9$ such that it satisfies $5,181 < ???9 < 6,001$.

Let's proceed with the following steps:

• Step 1: The number must be greater than 5,181. Given the format $???9$, the smallest number that matches this requirement is 5,189.
• Step 2: Verify this number is less than 6,001. The number 5,189 indeed fits this condition as well.
• Step 3: Therefore, the correct number is 5,189, conforming to $???9$ format.

Thus, substituting 5,189 into the inequality, we have $5,181 < 5,189 < 6,001$.

The choice that corresponds to the solution is: $5,1,8$.

Therefore, the solution to the problem is $5,1,8$.