Finding the Third Proportional to 11,709 and 21,756

Step by Step Solution

1. Step 1: Write the proportion equation
   11,709 : 21,756 = 21,756 : x
2. Step 2: Convert to fraction form
   11,709/21,756 = 21,756/x
3. Step 3: Cross multiply
   11,709x = 21,756 × 21,756
4. Step 4: Simplify right side
   11,709x = 473,323,536
5. Step 5: Solve for x
   x = 473,323,536/11,709
6. Step 6: Final answer
   x = 40,423.91