Finding the Third Proportional to 443,131.50 and 687,459

Step by Step Solution

1. Step 1: Write the proportion equation
   443,131.50 : 687,459 = 687,459 : x
2. Step 2: Convert to fraction form
   443,131.50/687,459 = 687,459/x
3. Step 3: Cross multiply
   443,131.50x = 687,459 × 687,459
4. Step 4: Simplify right side
   443,131.50x = 472,599,876,681
5. Step 5: Solve for x
   x = 472,599,876,681/443,131.50
6. Step 6: Final answer
   x = 1,066,500.30