Finding the Third Proportional to 3,899,858 and 8,695,912

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,858 : 8,695,912 = 8,695,912 : x
2. Step 2: Convert to fraction form
   3,899,858/8,695,912 = 8,695,912/x
3. Step 3: Cross multiply
   3,899,858x = 8,695,912 × 8,695,912
4. Step 4: Simplify right side
   3,899,858x = 75,618,885,511,744
5. Step 5: Solve for x
   x = 75,618,885,511,744/3,899,858
6. Step 6: Final answer
   x = 19,390,163.82