Finding the Fourth Proportional to 860,423.69, 1,187,385.67 and 478,442.27

Step by Step Solution

1. Step 1: Write the proportion equation
   860,423.69 : 1,187,385.67 = 478,442.27 : x
2. Step 2: Convert to fraction form
   860,423.69/1,187,385.67 = 478,442.27/x
3. Step 3: Cross multiply
   860,423.69x = 1,187,385.67 × 478,442.27
4. Step 4: Simplify right side
   860,423.69x = 568,095,495,320.27
5. Step 5: Solve for x
   x = 568,095,495,320.27/860,423.69
6. Step 6: Final answer
   x = 660,250.88