Finding the Third Proportional to 209,055 and 318,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   209,055 : 318,496.50 = 318,496.50 : x
2. Step 2: Convert to fraction form
   209,055/318,496.50 = 318,496.50/x
3. Step 3: Cross multiply
   209,055x = 318,496.50 × 318,496.50
4. Step 4: Simplify right side
   209,055x = 101,440,020,512.25
5. Step 5: Solve for x
   x = 101,440,020,512.25/209,055
6. Step 6: Final answer
   x = 485,231.26