Finding the Fourth Proportional to 423,786.98, 635,139.39 and 198,651.50

Step by Step Solution

1. Step 1: Write the proportion equation
   423,786.98 : 635,139.39 = 198,651.50 : x
2. Step 2: Convert to fraction form
   423,786.98/635,139.39 = 198,651.50/x
3. Step 3: Cross multiply
   423,786.98x = 635,139.39 × 198,651.50
4. Step 4: Simplify right side
   423,786.98x = 126,171,389,356.89
5. Step 5: Solve for x
   x = 126,171,389,356.89/423,786.98
6. Step 6: Final answer
   x = 297,723.61