Question Statement:
The normal annual precipitations at rain gauge stations X, A, B, and C are $N_X = 900.0\text{ mm}$, $N_A = 800.0\text{ mm}$, $N_B = 1000.0\text{ mm}$, and $N_C = 950.0\text{ mm}$. During a storm event, stations A, B, and C recorded storm rainfalls of $P_A = 65.0\text{ mm}$, $P_B = 85.0\text{ mm}$, and $P_C = 78.0\text{ mm}$, while gauge X was inoperative. Using the Normal Ratio Method, the estimated storm rainfall $P_X$ at station X in $\text{mm}$ is ________ (round off to one decimal place).