Finding the Third Proportional to 12,866 and 18,521

Step by Step Solution

1. Step 1: Write the proportion equation
   12,866 : 18,521 = 18,521 : x
2. Step 2: Convert to fraction form
   12,866/18,521 = 18,521/x
3. Step 3: Cross multiply
   12,866x = 18,521 × 18,521
4. Step 4: Simplify right side
   12,866x = 343,027,441
5. Step 5: Solve for x
   x = 343,027,441/12,866
6. Step 6: Final answer
   x = 26,661.55