Finding the Third Proportional to 309,008 and 677,048

Step by Step Solution

1. Step 1: Write the proportion equation
   309,008 : 677,048 = 677,048 : x
2. Step 2: Convert to fraction form
   309,008/677,048 = 677,048/x
3. Step 3: Cross multiply
   309,008x = 677,048 × 677,048
4. Step 4: Simplify right side
   309,008x = 458,393,994,304
5. Step 5: Solve for x
   x = 458,393,994,304/309,008
6. Step 6: Final answer
   x = 1,483,437.30