Finding the Third Proportional to 3,943.69 and 8,584.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,943.69 : 8,584.31 = 8,584.31 : x
2. Step 2: Convert to fraction form
   3,943.69/8,584.31 = 8,584.31/x
3. Step 3: Cross multiply
   3,943.69x = 8,584.31 × 8,584.31
4. Step 4: Simplify right side
   3,943.69x = 73,690,421.10
5. Step 5: Solve for x
   x = 73,690,421.10/3,943.69
6. Step 6: Final answer
   x = 18,685.66