Finding the Third Proportional to 398,909.25 and 864,279

Step by Step Solution

1. Step 1: Write the proportion equation
   398,909.25 : 864,279 = 864,279 : x
2. Step 2: Convert to fraction form
   398,909.25/864,279 = 864,279/x
3. Step 3: Cross multiply
   398,909.25x = 864,279 × 864,279
4. Step 4: Simplify right side
   398,909.25x = 746,978,189,841
5. Step 5: Solve for x
   x = 746,978,189,841/398,909.25
6. Step 6: Final answer
   x = 1,872,551.69