Finding the Fourth Proportional to 557,978.61, 769,287.74 and 361,395.33

Step by Step Solution

1. Step 1: Write the proportion equation
   557,978.61 : 769,287.74 = 361,395.33 : x
2. Step 2: Convert to fraction form
   557,978.61/769,287.74 = 361,395.33/x
3. Step 3: Cross multiply
   557,978.61x = 769,287.74 × 361,395.33
4. Step 4: Simplify right side
   557,978.61x = 278,016,995,150.50
5. Step 5: Solve for x
   x = 278,016,995,150.50/557,978.61
6. Step 6: Final answer
   x = 498,257.44