Finding the Third Proportional to 3,863,706 and 8,391,128

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,706 : 8,391,128 = 8,391,128 : x
2. Step 2: Convert to fraction form
   3,863,706/8,391,128 = 8,391,128/x
3. Step 3: Cross multiply
   3,863,706x = 8,391,128 × 8,391,128
4. Step 4: Simplify right side
   3,863,706x = 70,411,029,112,384
5. Step 5: Solve for x
   x = 70,411,029,112,384/3,863,706
6. Step 6: Final answer
   x = 18,223,702.61