Finding the Third Proportional to 443,128 and 687,453

Step by Step Solution

1. Step 1: Write the proportion equation
   443,128 : 687,453 = 687,453 : x
2. Step 2: Convert to fraction form
   443,128/687,453 = 687,453/x
3. Step 3: Cross multiply
   443,128x = 687,453 × 687,453
4. Step 4: Simplify right side
   443,128x = 472,591,627,209
5. Step 5: Solve for x
   x = 472,591,627,209/443,128
6. Step 6: Final answer
   x = 1,066,490.10