Finding the Third Proportional to 17,917 and 21,238

Step by Step Solution

1. Step 1: Write the proportion equation
   17,917 : 21,238 = 21,238 : x
2. Step 2: Convert to fraction form
   17,917/21,238 = 21,238/x
3. Step 3: Cross multiply
   17,917x = 21,238 × 21,238
4. Step 4: Simplify right side
   17,917x = 451,052,644
5. Step 5: Solve for x
   x = 451,052,644/17,917
6. Step 6: Final answer
   x = 25,174.56