Finding the Fourth Proportional to 103.43, 141.77 and 102.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103.43 : 141.77 = 102.72 : x
2. Step 2: Convert to fraction form
   103.43/141.77 = 102.72/x
3. Step 3: Cross multiply
   103.43x = 141.77 × 102.72
4. Step 4: Simplify right side
   103.43x = 14,562.10
5. Step 5: Solve for x
   x = 14,562.10/103.43
6. Step 6: Final answer
   x = 140.80