Finding the Third Proportional to 3,969,886 and 8,611,783

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,886 : 8,611,783 = 8,611,783 : x
2. Step 2: Convert to fraction form
   3,969,886/8,611,783 = 8,611,783/x
3. Step 3: Cross multiply
   3,969,886x = 8,611,783 × 8,611,783
4. Step 4: Simplify right side
   3,969,886x = 74,162,806,439,089
5. Step 5: Solve for x
   x = 74,162,806,439,089/3,969,886
6. Step 6: Final answer
   x = 18,681,344.11