Finding the Fourth Proportional to 898,689.53, 1,240,185.25 and 490,791.50

Step by Step Solution

1. Step 1: Write the proportion equation
   898,689.53 : 1,240,185.25 = 490,791.50 : x
2. Step 2: Convert to fraction form
   898,689.53/1,240,185.25 = 490,791.50/x
3. Step 3: Cross multiply
   898,689.53x = 1,240,185.25 × 490,791.50
4. Step 4: Simplify right side
   898,689.53x = 608,672,371,697.47
5. Step 5: Solve for x
   x = 608,672,371,697.47/898,689.53
6. Step 6: Final answer
   x = 677,288.82