Finding the Fourth Proportional to 109.50, 151.02 and 86.15

Step by Step Solution

1. Step 1: Write the proportion equation
   109.50 : 151.02 = 86.15 : x
2. Step 2: Convert to fraction form
   109.50/151.02 = 86.15/x
3. Step 3: Cross multiply
   109.50x = 151.02 × 86.15
4. Step 4: Simplify right side
   109.50x = 13,009.62
5. Step 5: Solve for x
   x = 13,009.62/109.50
6. Step 6: Final answer
   x = 118.81