Finding the Fourth Proportional to 111.96, 167.58 and 99.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 167.58 = 99.72 : x
2. Step 2: Convert to fraction form
   111.96/167.58 = 99.72/x
3. Step 3: Cross multiply
   111.96x = 167.58 × 99.72
4. Step 4: Simplify right side
   111.96x = 16,711.08
5. Step 5: Solve for x
   x = 16,711.08/111.96
6. Step 6: Final answer
   x = 149.26