Finding the Third Proportional to 12,718 and 13,870

Step by Step Solution

1. Step 1: Write the proportion equation
   12,718 : 13,870 = 13,870 : x
2. Step 2: Convert to fraction form
   12,718/13,870 = 13,870/x
3. Step 3: Cross multiply
   12,718x = 13,870 × 13,870
4. Step 4: Simplify right side
   12,718x = 192,376,900
5. Step 5: Solve for x
   x = 192,376,900/12,718
6. Step 6: Final answer
   x = 15,126.35