Finding the Third Proportional to 443,078 and 664,455

Step by Step Solution

1. Step 1: Write the proportion equation
   443,078 : 664,455 = 664,455 : x
2. Step 2: Convert to fraction form
   443,078/664,455 = 664,455/x
3. Step 3: Cross multiply
   443,078x = 664,455 × 664,455
4. Step 4: Simplify right side
   443,078x = 441,500,447,025
5. Step 5: Solve for x
   x = 441,500,447,025/443,078
6. Step 6: Final answer
   x = 996,439.56