Finding the Third Proportional to 21,396 and 43,980

Step by Step Solution

1. Step 1: Write the proportion equation
   21,396 : 43,980 = 43,980 : x
2. Step 2: Convert to fraction form
   21,396/43,980 = 43,980/x
3. Step 3: Cross multiply
   21,396x = 43,980 × 43,980
4. Step 4: Simplify right side
   21,396x = 1,934,240,400
5. Step 5: Solve for x
   x = 1,934,240,400/21,396
6. Step 6: Final answer
   x = 90,401.96