Finding the Fourth Proportional to 99.27, 136.83 and 86.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99.27 : 136.83 = 86.10 : x
2. Step 2: Convert to fraction form
   99.27/136.83 = 86.10/x
3. Step 3: Cross multiply
   99.27x = 136.83 × 86.10
4. Step 4: Simplify right side
   99.27x = 11,781.06
5. Step 5: Solve for x
   x = 11,781.06/99.27
6. Step 6: Final answer
   x = 118.68