Finding the Third Proportional to 12,260 and 15,870

Step by Step Solution

1. Step 1: Write the proportion equation
   12,260 : 15,870 = 15,870 : x
2. Step 2: Convert to fraction form
   12,260/15,870 = 15,870/x
3. Step 3: Cross multiply
   12,260x = 15,870 × 15,870
4. Step 4: Simplify right side
   12,260x = 251,856,900
5. Step 5: Solve for x
   x = 251,856,900/12,260
6. Step 6: Final answer
   x = 20,542.98