Finding the Fourth Proportional to 810,978.98, 1,215,673.92 and 451,321.34

Step by Step Solution

1. Step 1: Write the proportion equation
   810,978.98 : 1,215,673.92 = 451,321.34 : x
2. Step 2: Convert to fraction form
   810,978.98/1,215,673.92 = 451,321.34/x
3. Step 3: Cross multiply
   810,978.98x = 1,215,673.92 × 451,321.34
4. Step 4: Simplify right side
   810,978.98x = 548,659,576,499.08
5. Step 5: Solve for x
   x = 548,659,576,499.08/810,978.98
6. Step 6: Final answer
   x = 676,539.83