Finding the Third Proportional to 3,542,680 and 5,639,820

Step by Step Solution

1. Step 1: Write the proportion equation
   3,542,680 : 5,639,820 = 5,639,820 : x
2. Step 2: Convert to fraction form
   3,542,680/5,639,820 = 5,639,820/x
3. Step 3: Cross multiply
   3,542,680x = 5,639,820 × 5,639,820
4. Step 4: Simplify right side
   3,542,680x = 31,807,569,632,400
5. Step 5: Solve for x
   x = 31,807,569,632,400/3,542,680
6. Step 6: Final answer
   x = 8,978,391.96