Finding the Fourth Proportional to 860,196.78, 1,187,143.38 and 478,259.10

Step by Step Solution

1. Step 1: Write the proportion equation
   860,196.78 : 1,187,143.38 = 478,259.10 : x
2. Step 2: Convert to fraction form
   860,196.78/1,187,143.38 = 478,259.10/x
3. Step 3: Cross multiply
   860,196.78x = 1,187,143.38 × 478,259.10
4. Step 4: Simplify right side
   860,196.78x = 567,762,124,489.76
5. Step 5: Solve for x
   x = 567,762,124,489.76/860,196.78
6. Step 6: Final answer
   x = 660,037.49