Finding the Third Proportional to 443,361 and 687,912

Step by Step Solution

1. Step 1: Write the proportion equation
   443,361 : 687,912 = 687,912 : x
2. Step 2: Convert to fraction form
   443,361/687,912 = 687,912/x
3. Step 3: Cross multiply
   443,361x = 687,912 × 687,912
4. Step 4: Simplify right side
   443,361x = 473,222,919,744
5. Step 5: Solve for x
   x = 473,222,919,744/443,361
6. Step 6: Final answer
   x = 1,067,353.51