Finding the Fourth Proportional to 103.37, 142.76 and 86.83

Step by Step Solution

1. Step 1: Write the proportion equation
   103.37 : 142.76 = 86.83 : x
2. Step 2: Convert to fraction form
   103.37/142.76 = 86.83/x
3. Step 3: Cross multiply
   103.37x = 142.76 × 86.83
4. Step 4: Simplify right side
   103.37x = 12,395.71
5. Step 5: Solve for x
   x = 12,395.71/103.37
6. Step 6: Final answer
   x = 119.92