Finding the Third Proportional to 443,130.50 and 687,457

Step by Step Solution

1. Step 1: Write the proportion equation
   443,130.50 : 687,457 = 687,457 : x
2. Step 2: Convert to fraction form
   443,130.50/687,457 = 687,457/x
3. Step 3: Cross multiply
   443,130.50x = 687,457 × 687,457
4. Step 4: Simplify right side
   443,130.50x = 472,597,126,849
5. Step 5: Solve for x
   x = 472,597,126,849/443,130.50
6. Step 6: Final answer
   x = 1,066,496.50