Finding the Third Proportional to 20,860 and 42,680

Step by Step Solution

1. Step 1: Write the proportion equation
   20,860 : 42,680 = 42,680 : x
2. Step 2: Convert to fraction form
   20,860/42,680 = 42,680/x
3. Step 3: Cross multiply
   20,860x = 42,680 × 42,680
4. Step 4: Simplify right side
   20,860x = 1,821,582,400
5. Step 5: Solve for x
   x = 1,821,582,400/20,860
6. Step 6: Final answer
   x = 87,324.18