Finding the Third Proportional to 10,215,515 and 21,980,885

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215,515 : 21,980,885 = 21,980,885 : x
2. Step 2: Convert to fraction form
   10,215,515/21,980,885 = 21,980,885/x
3. Step 3: Cross multiply
   10,215,515x = 21,980,885 × 21,980,885
4. Step 4: Simplify right side
   10,215,515x = 483,159,305,383,225
5. Step 5: Solve for x
   x = 483,159,305,383,225/10,215,515
6. Step 6: Final answer
   x = 47,296,617.49