Finding the Third Proportional to 210,212 and 317,500

Step by Step Solution

1. Step 1: Write the proportion equation
   210,212 : 317,500 = 317,500 : x
2. Step 2: Convert to fraction form
   210,212/317,500 = 317,500/x
3. Step 3: Cross multiply
   210,212x = 317,500 × 317,500
4. Step 4: Simplify right side
   210,212x = 100,806,250,000
5. Step 5: Solve for x
   x = 100,806,250,000/210,212
6. Step 6: Final answer
   x = 479,545.65