Finding the Third Proportional to 200,057 and 309,670

Step by Step Solution

1. Step 1: Write the proportion equation
   200,057 : 309,670 = 309,670 : x
2. Step 2: Convert to fraction form
   200,057/309,670 = 309,670/x
3. Step 3: Cross multiply
   200,057x = 309,670 × 309,670
4. Step 4: Simplify right side
   200,057x = 95,895,508,900
5. Step 5: Solve for x
   x = 95,895,508,900/200,057
6. Step 6: Final answer
   x = 479,340.93