Finding the Fourth Proportional to 860,196.20, 1,187,072.16 and 478,222.97

Step by Step Solution

1. Step 1: Write the proportion equation
   860,196.20 : 1,187,072.16 = 478,222.97 : x
2. Step 2: Convert to fraction form
   860,196.20/1,187,072.16 = 478,222.97/x
3. Step 3: Cross multiply
   860,196.20x = 1,187,072.16 × 478,222.97
4. Step 4: Simplify right side
   860,196.20x = 567,685,168,024.15
5. Step 5: Solve for x
   x = 567,685,168,024.15/860,196.20
6. Step 6: Final answer
   x = 659,948.48