Finding the Third Proportional to 443,158 and 687,499

Step by Step Solution

1. Step 1: Write the proportion equation
   443,158 : 687,499 = 687,499 : x
2. Step 2: Convert to fraction form
   443,158/687,499 = 687,499/x
3. Step 3: Cross multiply
   443,158x = 687,499 × 687,499
4. Step 4: Simplify right side
   443,158x = 472,654,875,001
5. Step 5: Solve for x
   x = 472,654,875,001/443,158
6. Step 6: Final answer
   x = 1,066,560.63