Finding the Third Proportional to 216,812 and 333,666

Step by Step Solution

1. Step 1: Write the proportion equation
   216,812 : 333,666 = 333,666 : x
2. Step 2: Convert to fraction form
   216,812/333,666 = 333,666/x
3. Step 3: Cross multiply
   216,812x = 333,666 × 333,666
4. Step 4: Simplify right side
   216,812x = 111,332,999,556
5. Step 5: Solve for x
   x = 111,332,999,556/216,812
6. Step 6: Final answer
   x = 513,500.17