Finding the Third Proportional to 309,562 and 677,450

Step by Step Solution

1. Step 1: Write the proportion equation
   309,562 : 677,450 = 677,450 : x
2. Step 2: Convert to fraction form
   309,562/677,450 = 677,450/x
3. Step 3: Cross multiply
   309,562x = 677,450 × 677,450
4. Step 4: Simplify right side
   309,562x = 458,938,502,500
5. Step 5: Solve for x
   x = 458,938,502,500/309,562
6. Step 6: Final answer
   x = 1,482,541.47