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To find the 4th number needed to achieve an average of 80, first calculate the total sum of the current 3 numbers, which is (3 \times 78 = 234). For an average of 80 with 4 numbers, the total sum must be (4 \times 80 = 320). Therefore, the 4th number can be found by subtracting the sum of the first 3 numbers from the desired total: (320 - 234 = 86). Thus, the 4th number needed is 86.

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