Finding the Third Proportional to 8,687,871 and 13,143,906

Step by Step Solution

1. Step 1: Write the proportion equation
   8,687,871 : 13,143,906 = 13,143,906 : x
2. Step 2: Convert to fraction form
   8,687,871/13,143,906 = 13,143,906/x
3. Step 3: Cross multiply
   8,687,871x = 13,143,906 × 13,143,906
4. Step 4: Simplify right side
   8,687,871x = 172,762,264,936,836
5. Step 5: Solve for x
   x = 172,762,264,936,836/8,687,871
6. Step 6: Final answer
   x = 19,885,454.67