Finding the Third Proportional to 3,969,864 and 8,611,860

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,864 : 8,611,860 = 8,611,860 : x
2. Step 2: Convert to fraction form
   3,969,864/8,611,860 = 8,611,860/x
3. Step 3: Cross multiply
   3,969,864x = 8,611,860 × 8,611,860
4. Step 4: Simplify right side
   3,969,864x = 74,164,132,659,600
5. Step 5: Solve for x
   x = 74,164,132,659,600/3,969,864
6. Step 6: Final answer
   x = 18,681,781.71