Finding the Third Proportional to 443,124 and 687,444

Step by Step Solution

1. Step 1: Write the proportion equation
   443,124 : 687,444 = 687,444 : x
2. Step 2: Convert to fraction form
   443,124/687,444 = 687,444/x
3. Step 3: Cross multiply
   443,124x = 687,444 × 687,444
4. Step 4: Simplify right side
   443,124x = 472,579,253,136
5. Step 5: Solve for x
   x = 472,579,253,136/443,124
6. Step 6: Final answer
   x = 1,066,471.81