Finding the Third Proportional to 443,153 and 687,492

Step by Step Solution

1. Step 1: Write the proportion equation
   443,153 : 687,492 = 687,492 : x
2. Step 2: Convert to fraction form
   443,153/687,492 = 687,492/x
3. Step 3: Cross multiply
   443,153x = 687,492 × 687,492
4. Step 4: Simplify right side
   443,153x = 472,645,250,064
5. Step 5: Solve for x
   x = 472,645,250,064/443,153
6. Step 6: Final answer
   x = 1,066,550.94