Finding the Fourth Proportional to 131,978.79, 198,099.99 and 72,842.31

Step by Step Solution

1. Step 1: Write the proportion equation
   131,978.79 : 198,099.99 = 72,842.31 : x
2. Step 2: Convert to fraction form
   131,978.79/198,099.99 = 72,842.31/x
3. Step 3: Cross multiply
   131,978.79x = 198,099.99 × 72,842.31
4. Step 4: Simplify right side
   131,978.79x = 14,430,060,882.58
5. Step 5: Solve for x
   x = 14,430,060,882.58/131,978.79
6. Step 6: Final answer
   x = 109,336.21