Finding the Fourth Proportional to 898,710.89, 1,240,227.90 and 490,805.31

Step by Step Solution

1. Step 1: Write the proportion equation
   898,710.89 : 1,240,227.90 = 490,805.31 : x
2. Step 2: Convert to fraction form
   898,710.89/1,240,227.90 = 490,805.31/x
3. Step 3: Cross multiply
   898,710.89x = 1,240,227.90 × 490,805.31
4. Step 4: Simplify right side
   898,710.89x = 608,710,438,930.15
5. Step 5: Solve for x
   x = 608,710,438,930.15/898,710.89
6. Step 6: Final answer
   x = 677,315.08