Finding the Third Proportional to 3,878,660 and 8,440,960

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878,660 : 8,440,960 = 8,440,960 : x
2. Step 2: Convert to fraction form
   3,878,660/8,440,960 = 8,440,960/x
3. Step 3: Cross multiply
   3,878,660x = 8,440,960 × 8,440,960
4. Step 4: Simplify right side
   3,878,660x = 71,249,805,721,600
5. Step 5: Solve for x
   x = 71,249,805,721,600/3,878,660
6. Step 6: Final answer
   x = 18,369,696.16