Finding the Third Proportional to 3,863,274 and 8,391,402

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,274 : 8,391,402 = 8,391,402 : x
2. Step 2: Convert to fraction form
   3,863,274/8,391,402 = 8,391,402/x
3. Step 3: Cross multiply
   3,863,274x = 8,391,402 × 8,391,402
4. Step 4: Simplify right side
   3,863,274x = 70,415,627,525,604
5. Step 5: Solve for x
   x = 70,415,627,525,604/3,863,274
6. Step 6: Final answer
   x = 18,226,930.71