Finding the Third Proportional to 443,351.50 and 687,900

Step by Step Solution

1. Step 1: Write the proportion equation
   443,351.50 : 687,900 = 687,900 : x
2. Step 2: Convert to fraction form
   443,351.50/687,900 = 687,900/x
3. Step 3: Cross multiply
   443,351.50x = 687,900 × 687,900
4. Step 4: Simplify right side
   443,351.50x = 473,206,410,000
5. Step 5: Solve for x
   x = 473,206,410,000/443,351.50
6. Step 6: Final answer
   x = 1,067,339.14