Finding the Third Proportional to 20,833 and 42,439

Step by Step Solution

1. Step 1: Write the proportion equation
   20,833 : 42,439 = 42,439 : x
2. Step 2: Convert to fraction form
   20,833/42,439 = 42,439/x
3. Step 3: Cross multiply
   20,833x = 42,439 × 42,439
4. Step 4: Simplify right side
   20,833x = 1,801,068,721
5. Step 5: Solve for x
   x = 1,801,068,721/20,833
6. Step 6: Final answer
   x = 86,452.68