Finding the Third Proportional to 3,940,604 and 8,509,912

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,604 : 8,509,912 = 8,509,912 : x
2. Step 2: Convert to fraction form
   3,940,604/8,509,912 = 8,509,912/x
3. Step 3: Cross multiply
   3,940,604x = 8,509,912 × 8,509,912
4. Step 4: Simplify right side
   3,940,604x = 72,418,602,247,744
5. Step 5: Solve for x
   x = 72,418,602,247,744/3,940,604
6. Step 6: Final answer
   x = 18,377,538.63