Finding the Third Proportional to 12,788 and 20,356

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788 : 20,356 = 20,356 : x
2. Step 2: Convert to fraction form
   12,788/20,356 = 20,356/x
3. Step 3: Cross multiply
   12,788x = 20,356 × 20,356
4. Step 4: Simplify right side
   12,788x = 414,366,736
5. Step 5: Solve for x
   x = 414,366,736/12,788
6. Step 6: Final answer
   x = 32,402.78