Finding the Third Proportional to 200,126.75 and 309,542

Step by Step Solution

1. Step 1: Write the proportion equation
   200,126.75 : 309,542 = 309,542 : x
2. Step 2: Convert to fraction form
   200,126.75/309,542 = 309,542/x
3. Step 3: Cross multiply
   200,126.75x = 309,542 × 309,542
4. Step 4: Simplify right side
   200,126.75x = 95,816,249,764
5. Step 5: Solve for x
   x = 95,816,249,764/200,126.75
6. Step 6: Final answer
   x = 478,777.82