Finding the Third Proportional to 12,928 and 20,656

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928 : 20,656 = 20,656 : x
2. Step 2: Convert to fraction form
   12,928/20,656 = 20,656/x
3. Step 3: Cross multiply
   12,928x = 20,656 × 20,656
4. Step 4: Simplify right side
   12,928x = 426,670,336
5. Step 5: Solve for x
   x = 426,670,336/12,928
6. Step 6: Final answer
   x = 33,003.58