Finding the Third Proportional to 439,598 and 685,078

Step by Step Solution

1. Step 1: Write the proportion equation
   439,598 : 685,078 = 685,078 : x
2. Step 2: Convert to fraction form
   439,598/685,078 = 685,078/x
3. Step 3: Cross multiply
   439,598x = 685,078 × 685,078
4. Step 4: Simplify right side
   439,598x = 469,331,866,084
5. Step 5: Solve for x
   x = 469,331,866,084/439,598
6. Step 6: Final answer
   x = 1,067,638.77