Finding the Fourth Proportional to 639,111.77, 882,293.82 and 397,472.20

Step by Step Solution

1. Step 1: Write the proportion equation
   639,111.77 : 882,293.82 = 397,472.20 : x
2. Step 2: Convert to fraction form
   639,111.77/882,293.82 = 397,472.20/x
3. Step 3: Cross multiply
   639,111.77x = 882,293.82 × 397,472.20
4. Step 4: Simplify right side
   639,111.77x = 350,687,261,985.55
5. Step 5: Solve for x
   x = 350,687,261,985.55/639,111.77
6. Step 6: Final answer
   x = 548,710.38