To find the percentage difference between two numbers, we first need to find the absolute difference between them. In this case, the absolute difference between 76 and 122 is 46 (122 - 76 = 46).

Next, we need to find what percentage this absolute difference is of the average of the two numbers. The average of 76 and 122 is (76 + 122) / 2 = 99.

So, the percentage difference between 76 and 122 is:

(46 / 99) x 100% = 46.46%

Therefore, the percentage difference between 76 and 122 is 46.46%. This means that the difference between 76 and 122 is 46.46% of the average of the two numbers.