Finding the Third Proportional to 12,520 and 20,872

Step by Step Solution

1. Step 1: Write the proportion equation
   12,520 : 20,872 = 20,872 : x
2. Step 2: Convert to fraction form
   12,520/20,872 = 20,872/x
3. Step 3: Cross multiply
   12,520x = 20,872 × 20,872
4. Step 4: Simplify right side
   12,520x = 435,640,384
5. Step 5: Solve for x
   x = 435,640,384/12,520
6. Step 6: Final answer
   x = 34,795.56