Finding the Third Proportional to 664,689 and 1,449,678

Step by Step Solution

1. Step 1: Write the proportion equation
   664,689 : 1,449,678 = 1,449,678 : x
2. Step 2: Convert to fraction form
   664,689/1,449,678 = 1,449,678/x
3. Step 3: Cross multiply
   664,689x = 1,449,678 × 1,449,678
4. Step 4: Simplify right side
   664,689x = 2,101,566,303,684
5. Step 5: Solve for x
   x = 2,101,566,303,684/664,689
6. Step 6: Final answer
   x = 3,161,728.72