Finding the Fourth Proportional to 698,978.25, 964,570.83 and 393,046.71

Step by Step Solution

1. Step 1: Write the proportion equation
   698,978.25 : 964,570.83 = 393,046.71 : x
2. Step 2: Convert to fraction form
   698,978.25/964,570.83 = 393,046.71/x
3. Step 3: Cross multiply
   698,978.25x = 964,570.83 × 393,046.71
4. Step 4: Simplify right side
   698,978.25x = 379,121,391,293.47
5. Step 5: Solve for x
   x = 379,121,391,293.47/698,978.25
6. Step 6: Final answer
   x = 542,393.69