Find the missing number?

92
78
97
85

The missing number is 97.

The numbers in the sequence are all prime numbers, except for the missing number. The missing number must be a prime number that is greater than 92 and less than 100. The only prime number that satisfies these conditions is 97.

Here is a list of all the prime numbers between 1 and 100:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.

As you can see, 97 is the only prime number that is greater than 92 and less than 100. Therefore, the missing number is 97.