Finding the Third Proportional to 3,969,888 and 8,611,787

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,888 : 8,611,787 = 8,611,787 : x
2. Step 2: Convert to fraction form
   3,969,888/8,611,787 = 8,611,787/x
3. Step 3: Cross multiply
   3,969,888x = 8,611,787 × 8,611,787
4. Step 4: Simplify right side
   3,969,888x = 74,162,875,333,369
5. Step 5: Solve for x
   x = 74,162,875,333,369/3,969,888
6. Step 6: Final answer
   x = 18,681,352.05