Finding the Third Proportional to 20,820 and 41,992

Step by Step Solution

1. Step 1: Write the proportion equation
   20,820 : 41,992 = 41,992 : x
2. Step 2: Convert to fraction form
   20,820/41,992 = 41,992/x
3. Step 3: Cross multiply
   20,820x = 41,992 × 41,992
4. Step 4: Simplify right side
   20,820x = 1,763,328,064
5. Step 5: Solve for x
   x = 1,763,328,064/20,820
6. Step 6: Final answer
   x = 84,693.95