Finding the Fourth Proportional to 109.86, 150.72 and 99.24

Step by Step Solution

1. Step 1: Write the proportion equation
   109.86 : 150.72 = 99.24 : x
2. Step 2: Convert to fraction form
   109.86/150.72 = 99.24/x
3. Step 3: Cross multiply
   109.86x = 150.72 × 99.24
4. Step 4: Simplify right side
   109.86x = 14,957.45
5. Step 5: Solve for x
   x = 14,957.45/109.86
6. Step 6: Final answer
   x = 136.15