Finding the Fourth Proportional to 861,498.78, 1,188,868.35 and 479,517.38

Step by Step Solution

1. Step 1: Write the proportion equation
   861,498.78 : 1,188,868.35 = 479,517.38 : x
2. Step 2: Convert to fraction form
   861,498.78/1,188,868.35 = 479,517.38/x
3. Step 3: Cross multiply
   861,498.78x = 1,188,868.35 × 479,517.38
4. Step 4: Simplify right side
   861,498.78x = 570,083,036,356.92
5. Step 5: Solve for x
   x = 570,083,036,356.92/861,498.78
6. Step 6: Final answer
   x = 661,734.00