Finding the Third Proportional to 443,172 and 687,516

Step by Step Solution

1. Step 1: Write the proportion equation
   443,172 : 687,516 = 687,516 : x
2. Step 2: Convert to fraction form
   443,172/687,516 = 687,516/x
3. Step 3: Cross multiply
   443,172x = 687,516 × 687,516
4. Step 4: Simplify right side
   443,172x = 472,678,250,256
5. Step 5: Solve for x
   x = 472,678,250,256/443,172
6. Step 6: Final answer
   x = 1,066,579.68