Finding the Third Proportional to 3,863,709 and 8,391,132

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,709 : 8,391,132 = 8,391,132 : x
2. Step 2: Convert to fraction form
   3,863,709/8,391,132 = 8,391,132/x
3. Step 3: Cross multiply
   3,863,709x = 8,391,132 × 8,391,132
4. Step 4: Simplify right side
   3,863,709x = 70,411,096,241,424
5. Step 5: Solve for x
   x = 70,411,096,241,424/3,863,709
6. Step 6: Final answer
   x = 18,223,705.83