Finding the Third Proportional to 12,608 and 20,940

Step by Step Solution

1. Step 1: Write the proportion equation
   12,608 : 20,940 = 20,940 : x
2. Step 2: Convert to fraction form
   12,608/20,940 = 20,940/x
3. Step 3: Cross multiply
   12,608x = 20,940 × 20,940
4. Step 4: Simplify right side
   12,608x = 438,483,600
5. Step 5: Solve for x
   x = 438,483,600/12,608
6. Step 6: Final answer
   x = 34,778.20