Finding the Fourth Proportional to 718,404.24, 991,404.56 and 396,125.88

Step by Step Solution

1. Step 1: Write the proportion equation
   718,404.24 : 991,404.56 = 396,125.88 : x
2. Step 2: Convert to fraction form
   718,404.24/991,404.56 = 396,125.88/x
3. Step 3: Cross multiply
   718,404.24x = 991,404.56 × 396,125.88
4. Step 4: Simplify right side
   718,404.24x = 392,721,003,766.01
5. Step 5: Solve for x
   x = 392,721,003,766.01/718,404.24
6. Step 6: Final answer
   x = 546,657.41