Finding the Third Proportional to 42,668 and 57,439

Step by Step Solution

1. Step 1: Write the proportion equation
   42,668 : 57,439 = 57,439 : x
2. Step 2: Convert to fraction form
   42,668/57,439 = 57,439/x
3. Step 3: Cross multiply
   42,668x = 57,439 × 57,439
4. Step 4: Simplify right side
   42,668x = 3,299,238,721
5. Step 5: Solve for x
   x = 3,299,238,721/42,668
6. Step 6: Final answer
   x = 77,323.49