Finding the Third Proportional to 10,872 and 21,987

Step by Step Solution

1. Step 1: Write the proportion equation
   10,872 : 21,987 = 21,987 : x
2. Step 2: Convert to fraction form
   10,872/21,987 = 21,987/x
3. Step 3: Cross multiply
   10,872x = 21,987 × 21,987
4. Step 4: Simplify right side
   10,872x = 483,428,169
5. Step 5: Solve for x
   x = 483,428,169/10,872
6. Step 6: Final answer
   x = 44,465.43