Finding the Third Proportional to 443,867 and 686,516

Step by Step Solution

1. Step 1: Write the proportion equation
   443,867 : 686,516 = 686,516 : x
2. Step 2: Convert to fraction form
   443,867/686,516 = 686,516/x
3. Step 3: Cross multiply
   443,867x = 686,516 × 686,516
4. Step 4: Simplify right side
   443,867x = 471,304,218,256
5. Step 5: Solve for x
   x = 471,304,218,256/443,867
6. Step 6: Final answer
   x = 1,061,814.05