Evaluate the expression. \[ \log _{15} 89.5 \approx \square \] (Type an integer or a deci

Step 1 ：To solve this problem, we need to calculate the logarithm of 89.5 to the base 15.

Step 2 ：The logarithm function returns the logarithm of a number to the specified base.

Step 3 ：In this case, we calculate the logarithm of 89.5 to the base 15 and get approximately 1.6595846795792777.

Step 4 ：So, the final answer is approximately \(\boxed{1.66}\).