Finding the Third Proportional to 11,276 and 21,142

Step by Step Solution

1. Step 1: Write the proportion equation
   11,276 : 21,142 = 21,142 : x
2. Step 2: Convert to fraction form
   11,276/21,142 = 21,142/x
3. Step 3: Cross multiply
   11,276x = 21,142 × 21,142
4. Step 4: Simplify right side
   11,276x = 446,984,164
5. Step 5: Solve for x
   x = 446,984,164/11,276
6. Step 6: Final answer
   x = 39,640.31