Finding the Fourth Proportional to 103.62, 142.83 and 86.07

Step by Step Solution

1. Step 1: Write the proportion equation
   103.62 : 142.83 = 86.07 : x
2. Step 2: Convert to fraction form
   103.62/142.83 = 86.07/x
3. Step 3: Cross multiply
   103.62x = 142.83 × 86.07
4. Step 4: Simplify right side
   103.62x = 12,293.38
5. Step 5: Solve for x
   x = 12,293.38/103.62
6. Step 6: Final answer
   x = 118.64