Finding the Fourth Proportional to 911,814.83, 1,258,308.39 and 498,359.94

Step by Step Solution

1. Step 1: Write the proportion equation
   911,814.83 : 1,258,308.39 = 498,359.94 : x
2. Step 2: Convert to fraction form
   911,814.83/1,258,308.39 = 498,359.94/x
3. Step 3: Cross multiply
   911,814.83x = 1,258,308.39 × 498,359.94
4. Step 4: Simplify right side
   911,814.83x = 627,090,493,741.90
5. Step 5: Solve for x
   x = 627,090,493,741.90/911,814.83
6. Step 6: Final answer
   x = 687,738.86