Finding the Fourth Proportional to 111.50, 166.13 and 99.37

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 166.13 = 99.37 : x
2. Step 2: Convert to fraction form
   111.50/166.13 = 99.37/x
3. Step 3: Cross multiply
   111.50x = 166.13 × 99.37
4. Step 4: Simplify right side
   111.50x = 16,507.84
5. Step 5: Solve for x
   x = 16,507.84/111.50
6. Step 6: Final answer
   x = 148.06