Finding the Fourth Proportional to 647,105.88, 892,743.08 and 429,417.21

Step by Step Solution

1. Step 1: Write the proportion equation
   647,105.88 : 892,743.08 = 429,417.21 : x
2. Step 2: Convert to fraction form
   647,105.88/892,743.08 = 429,417.21/x
3. Step 3: Cross multiply
   647,105.88x = 892,743.08 × 429,417.21
4. Step 4: Simplify right side
   647,105.88x = 383,359,240,513.32
5. Step 5: Solve for x
   x = 383,359,240,513.32/647,105.88
6. Step 6: Final answer
   x = 592,421.20