Finding the Third Proportional to 664,272 and 1,057,491

Step by Step Solution

1. Step 1: Write the proportion equation
   664,272 : 1,057,491 = 1,057,491 : x
2. Step 2: Convert to fraction form
   664,272/1,057,491 = 1,057,491/x
3. Step 3: Cross multiply
   664,272x = 1,057,491 × 1,057,491
4. Step 4: Simplify right side
   664,272x = 1,118,287,215,081
5. Step 5: Solve for x
   x = 1,118,287,215,081/664,272
6. Step 6: Final answer
   x = 1,683,477.88