Equivalent Mud Weight-Petroleum Engineering Help

Okay, so I need help with this EMW (equivalent mud weight) problem. I have been using the formula (P/Total Depth of Well) *19.25 but I am getting a very low answer. I don’t know why/how you use the fracture gradient in this problem. I feel that might be the key. Help would appreciated !

The answer is circled in blue (18.25 ppg)

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