Finding the Third Proportional to 320,031 and 687,510

Step by Step Solution

1. Step 1: Write the proportion equation
   320,031 : 687,510 = 687,510 : x
2. Step 2: Convert to fraction form
   320,031/687,510 = 687,510/x
3. Step 3: Cross multiply
   320,031x = 687,510 × 687,510
4. Step 4: Simplify right side
   320,031x = 472,670,000,100
5. Step 5: Solve for x
   x = 472,670,000,100/320,031
6. Step 6: Final answer
   x = 1,476,950.67