Finding the Third Proportional to 10,191 and 21,918

Step by Step Solution

1. Step 1: Write the proportion equation
   10,191 : 21,918 = 21,918 : x
2. Step 2: Convert to fraction form
   10,191/21,918 = 21,918/x
3. Step 3: Cross multiply
   10,191x = 21,918 × 21,918
4. Step 4: Simplify right side
   10,191x = 480,398,724
5. Step 5: Solve for x
   x = 480,398,724/10,191
6. Step 6: Final answer
   x = 47,139.51