Finding the Third Proportional to 207,369 and 317,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   207,369 : 317,209.50 = 317,209.50 : x
2. Step 2: Convert to fraction form
   207,369/317,209.50 = 317,209.50/x
3. Step 3: Cross multiply
   207,369x = 317,209.50 × 317,209.50
4. Step 4: Simplify right side
   207,369x = 100,621,866,890.25
5. Step 5: Solve for x
   x = 100,621,866,890.25/207,369
6. Step 6: Final answer
   x = 485,231.00