Finding the Third Proportional to 13,900 and 21,555

Step by Step Solution

1. Step 1: Write the proportion equation
   13,900 : 21,555 = 21,555 : x
2. Step 2: Convert to fraction form
   13,900/21,555 = 21,555/x
3. Step 3: Cross multiply
   13,900x = 21,555 × 21,555
4. Step 4: Simplify right side
   13,900x = 464,618,025
5. Step 5: Solve for x
   x = 464,618,025/13,900
6. Step 6: Final answer
   x = 33,425.76