Finding the Third Proportional to 21,605 and 43,978

Step by Step Solution

1. Step 1: Write the proportion equation
   21,605 : 43,978 = 43,978 : x
2. Step 2: Convert to fraction form
   21,605/43,978 = 43,978/x
3. Step 3: Cross multiply
   21,605x = 43,978 × 43,978
4. Step 4: Simplify right side
   21,605x = 1,934,064,484
5. Step 5: Solve for x
   x = 1,934,064,484/21,605
6. Step 6: Final answer
   x = 89,519.30