Fill the Gap: Find the Missing Number in 31,089 < ◻ < 31,099

To solve this problem, we'll follow these steps:

• Step 1: Identify the given boundaries: 31,089 and 31,099.
• Step 2: Determine the range of numbers that can be placed in the box, considering the inequalities $31,089 < \Box < 31,099$.
• Step 3: Compare available choices against the range of valid numbers.

Now, let's work through each step:
Step 1: The problem specifies two boundary values, 31,089 and 31,099.
Step 2: We need to select a number greater than 31,089 but less than 31,099. Valid numbers in this set include 31,090, 31,091, 31,092, 31,093, 31,094, 31,095, 31,096, 31,097, and 31,098.
Step 3: Among the choices provided, only 31,093 lies within this range.

Therefore, the solution to this problem is $31,093$.