There are eight numbers whose average is 9.2. The average of the first four numbers is 8.9, and the average of the last five numbers is 9.5. What is the fourth number? What's the formula

The sum of eight numbers is: 8 * 9.2 = 73.6
The sum of the first four numbers: 4 * 8.9 = 35.6
The sum of the last five numbers: 9.5 * 5 = 47.5
The fourth number is: 47.5 + 35.6-73.6 = 9.5
That is, the fourth number is 9.5

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