Finding the Fourth Proportional to 898,300.55, 1,239,673.52 and 490,419.59

Step by Step Solution

1. Step 1: Write the proportion equation
   898,300.55 : 1,239,673.52 = 490,419.59 : x
2. Step 2: Convert to fraction form
   898,300.55/1,239,673.52 = 490,419.59/x
3. Step 3: Cross multiply
   898,300.55x = 1,239,673.52 × 490,419.59
4. Step 4: Simplify right side
   898,300.55x = 607,960,170,761.79
5. Step 5: Solve for x
   x = 607,960,170,761.79/898,300.55
6. Step 6: Final answer
   x = 676,789.27