Finding the Fourth Proportional to 680,089.10, 1,018,733.15 and 398,928.38

Step by Step Solution

1. Step 1: Write the proportion equation
   680,089.10 : 1,018,733.15 = 398,928.38 : x
2. Step 2: Convert to fraction form
   680,089.10/1,018,733.15 = 398,928.38/x
3. Step 3: Cross multiply
   680,089.10x = 1,018,733.15 × 398,928.38
4. Step 4: Simplify right side
   680,089.10x = 406,401,561,085.45
5. Step 5: Solve for x
   x = 406,401,561,085.45/680,089.10
6. Step 6: Final answer
   x = 597,571.06