Finding the Third Proportional to 3,542,640 and 5,639,772

Step by Step Solution

1. Step 1: Write the proportion equation
   3,542,640 : 5,639,772 = 5,639,772 : x
2. Step 2: Convert to fraction form
   3,542,640/5,639,772 = 5,639,772/x
3. Step 3: Cross multiply
   3,542,640x = 5,639,772 × 5,639,772
4. Step 4: Simplify right side
   3,542,640x = 31,807,028,211,984
5. Step 5: Solve for x
   x = 31,807,028,211,984/3,542,640
6. Step 6: Final answer
   x = 8,978,340.51