Finding the Third Proportional to 3,947,618 and 8,609,170

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947,618 : 8,609,170 = 8,609,170 : x
2. Step 2: Convert to fraction form
   3,947,618/8,609,170 = 8,609,170/x
3. Step 3: Cross multiply
   3,947,618x = 8,609,170 × 8,609,170
4. Step 4: Simplify right side
   3,947,618x = 74,117,808,088,900
5. Step 5: Solve for x
   x = 74,117,808,088,900/3,947,618
6. Step 6: Final answer
   x = 18,775,324.28