Finding the Third Proportional to 209,055 and 315,540

Step by Step Solution

1. Step 1: Write the proportion equation
   209,055 : 315,540 = 315,540 : x
2. Step 2: Convert to fraction form
   209,055/315,540 = 315,540/x
3. Step 3: Cross multiply
   209,055x = 315,540 × 315,540
4. Step 4: Simplify right side
   209,055x = 99,565,491,600
5. Step 5: Solve for x
   x = 99,565,491,600/209,055
6. Step 6: Final answer
   x = 476,264.58