Finding the Third Proportional to 12,218 and 25,870

Step by Step Solution

1. Step 1: Write the proportion equation
   12,218 : 25,870 = 25,870 : x
2. Step 2: Convert to fraction form
   12,218/25,870 = 25,870/x
3. Step 3: Cross multiply
   12,218x = 25,870 × 25,870
4. Step 4: Simplify right side
   12,218x = 669,256,900
5. Step 5: Solve for x
   x = 669,256,900/12,218
6. Step 6: Final answer
   x = 54,776.31