Finding the Third Proportional to 443,130.75 and 687,456

Step by Step Solution

1. Step 1: Write the proportion equation
   443,130.75 : 687,456 = 687,456 : x
2. Step 2: Convert to fraction form
   443,130.75/687,456 = 687,456/x
3. Step 3: Cross multiply
   443,130.75x = 687,456 × 687,456
4. Step 4: Simplify right side
   443,130.75x = 472,595,751,936
5. Step 5: Solve for x
   x = 472,595,751,936/443,130.75
6. Step 6: Final answer
   x = 1,066,492.79