Finding the Third Proportional to 10,870 and 21,401

Step by Step Solution

1. Step 1: Write the proportion equation
   10,870 : 21,401 = 21,401 : x
2. Step 2: Convert to fraction form
   10,870/21,401 = 21,401/x
3. Step 3: Cross multiply
   10,870x = 21,401 × 21,401
4. Step 4: Simplify right side
   10,870x = 458,002,801
5. Step 5: Solve for x
   x = 458,002,801/10,870
6. Step 6: Final answer
   x = 42,134.57