Finding the Fourth Proportional to 898,728.93, 1,240,239.61 and 490,830.89

Step by Step Solution

1. Step 1: Write the proportion equation
   898,728.93 : 1,240,239.61 = 490,830.89 : x
2. Step 2: Convert to fraction form
   898,728.93/1,240,239.61 = 490,830.89/x
3. Step 3: Cross multiply
   898,728.93x = 1,240,239.61 × 490,830.89
4. Step 4: Simplify right side
   898,728.93x = 608,747,906,001.89
5. Step 5: Solve for x
   x = 608,747,906,001.89/898,728.93
6. Step 6: Final answer
   x = 677,343.17