Finding the Fourth Proportional to 102.24, 141.71 and 100.86

Step by Step Solution

1. Step 1: Write the proportion equation
   102.24 : 141.71 = 100.86 : x
2. Step 2: Convert to fraction form
   102.24/141.71 = 100.86/x
3. Step 3: Cross multiply
   102.24x = 141.71 × 100.86
4. Step 4: Simplify right side
   102.24x = 14,292.37
5. Step 5: Solve for x
   x = 14,292.37/102.24
6. Step 6: Final answer
   x = 139.79