Finding the Third Proportional to 11,921 and 15,676

Step by Step Solution

1. Step 1: Write the proportion equation
   11,921 : 15,676 = 15,676 : x
2. Step 2: Convert to fraction form
   11,921/15,676 = 15,676/x
3. Step 3: Cross multiply
   11,921x = 15,676 × 15,676
4. Step 4: Simplify right side
   11,921x = 245,736,976
5. Step 5: Solve for x
   x = 245,736,976/11,921
6. Step 6: Final answer
   x = 20,613.79