Finding the Third Proportional to 3,863,728 and 8,391,168

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,728 : 8,391,168 = 8,391,168 : x
2. Step 2: Convert to fraction form
   3,863,728/8,391,168 = 8,391,168/x
3. Step 3: Cross multiply
   3,863,728x = 8,391,168 × 8,391,168
4. Step 4: Simplify right side
   3,863,728x = 70,411,700,404,224
5. Step 5: Solve for x
   x = 70,411,700,404,224/3,863,728
6. Step 6: Final answer
   x = 18,223,772.59