Finding the Third Proportional to 3,906,180 and 8,557,128

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906,180 : 8,557,128 = 8,557,128 : x
2. Step 2: Convert to fraction form
   3,906,180/8,557,128 = 8,557,128/x
3. Step 3: Cross multiply
   3,906,180x = 8,557,128 × 8,557,128
4. Step 4: Simplify right side
   3,906,180x = 73,224,439,608,384
5. Step 5: Solve for x
   x = 73,224,439,608,384/3,906,180
6. Step 6: Final answer
   x = 18,745,792.46