Finding the Third Proportional to 443,209.50 and 664,679.25

Step by Step Solution

1. Step 1: Write the proportion equation
   443,209.50 : 664,679.25 = 664,679.25 : x
2. Step 2: Convert to fraction form
   443,209.50/664,679.25 = 664,679.25/x
3. Step 3: Cross multiply
   443,209.50x = 664,679.25 × 664,679.25
4. Step 4: Simplify right side
   443,209.50x = 441,798,505,380.56
5. Step 5: Solve for x
   x = 441,798,505,380.56/443,209.50
6. Step 6: Final answer
   x = 996,816.42