Finding the Third Proportional to 309,004 and 677,040

Step by Step Solution

1. Step 1: Write the proportion equation
   309,004 : 677,040 = 677,040 : x
2. Step 2: Convert to fraction form
   309,004/677,040 = 677,040/x
3. Step 3: Cross multiply
   309,004x = 677,040 × 677,040
4. Step 4: Simplify right side
   309,004x = 458,383,161,600
5. Step 5: Solve for x
   x = 458,383,161,600/309,004
6. Step 6: Final answer
   x = 1,483,421.45