Finding the Third Proportional to 3,668,878 and 5,558,721

Step by Step Solution

1. Step 1: Write the proportion equation
   3,668,878 : 5,558,721 = 5,558,721 : x
2. Step 2: Convert to fraction form
   3,668,878/5,558,721 = 5,558,721/x
3. Step 3: Cross multiply
   3,668,878x = 5,558,721 × 5,558,721
4. Step 4: Simplify right side
   3,668,878x = 30,899,379,155,841
5. Step 5: Solve for x
   x = 30,899,379,155,841/3,668,878
6. Step 6: Final answer
   x = 8,422,024.16