Finding the Third Proportional to 309,552 and 677,430

Step by Step Solution

1. Step 1: Write the proportion equation
   309,552 : 677,430 = 677,430 : x
2. Step 2: Convert to fraction form
   309,552/677,430 = 677,430/x
3. Step 3: Cross multiply
   309,552x = 677,430 × 677,430
4. Step 4: Simplify right side
   309,552x = 458,911,404,900
5. Step 5: Solve for x
   x = 458,911,404,900/309,552
6. Step 6: Final answer
   x = 1,482,501.82