Finding the Fourth Proportional to 102,143.76, 140,842.17 and 71,919.42

Step by Step Solution

1. Step 1: Write the proportion equation
   102,143.76 : 140,842.17 = 71,919.42 : x
2. Step 2: Convert to fraction form
   102,143.76/140,842.17 = 71,919.42/x
3. Step 3: Cross multiply
   102,143.76x = 140,842.17 × 71,919.42
4. Step 4: Simplify right side
   102,143.76x = 10,129,287,177.94
5. Step 5: Solve for x
   x = 10,129,287,177.94/102,143.76
6. Step 6: Final answer
   x = 99,166.97