Finding the Fourth Proportional to 647,308.68, 892,920.15 and 405,170.82

Step by Step Solution

1. Step 1: Write the proportion equation
   647,308.68 : 892,920.15 = 405,170.82 : x
2. Step 2: Convert to fraction form
   647,308.68/892,920.15 = 405,170.82/x
3. Step 3: Cross multiply
   647,308.68x = 892,920.15 × 405,170.82
4. Step 4: Simplify right side
   647,308.68x = 361,785,189,370.02
5. Step 5: Solve for x
   x = 361,785,189,370.02/647,308.68
6. Step 6: Final answer
   x = 558,906.75