Finding the Fourth Proportional to 131,819.31, 181,909.70 and 71,388.55

Step by Step Solution

1. Step 1: Write the proportion equation
   131,819.31 : 181,909.70 = 71,388.55 : x
2. Step 2: Convert to fraction form
   131,819.31/181,909.70 = 71,388.55/x
3. Step 3: Cross multiply
   131,819.31x = 181,909.70 × 71,388.55
4. Step 4: Simplify right side
   131,819.31x = 12,986,269,713.94
5. Step 5: Solve for x
   x = 12,986,269,713.94/131,819.31
6. Step 6: Final answer
   x = 98,515.69