Finding the Third Proportional to 5,159 and 10,561

Step by Step Solution

1. Step 1: Write the proportion equation
   5,159 : 10,561 = 10,561 : x
2. Step 2: Convert to fraction form
   5,159/10,561 = 10,561/x
3. Step 3: Cross multiply
   5,159x = 10,561 × 10,561
4. Step 4: Simplify right side
   5,159x = 111,534,721
5. Step 5: Solve for x
   x = 111,534,721/5,159
6. Step 6: Final answer
   x = 21,619.45