Finding the Third Proportional to 3,651,661 and 7,880,678

Step by Step Solution

1. Step 1: Write the proportion equation
   3,651,661 : 7,880,678 = 7,880,678 : x
2. Step 2: Convert to fraction form
   3,651,661/7,880,678 = 7,880,678/x
3. Step 3: Cross multiply
   3,651,661x = 7,880,678 × 7,880,678
4. Step 4: Simplify right side
   3,651,661x = 62,105,085,739,684
5. Step 5: Solve for x
   x = 62,105,085,739,684/3,651,661
6. Step 6: Final answer
   x = 17,007,352.47