Finding the Fourth Proportional to 8,680.09, 13,002.72 and 3,993.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,680.09 : 13,002.72 = 3,993.57 : x
2. Step 2: Convert to fraction form
   8,680.09/13,002.72 = 3,993.57/x
3. Step 3: Cross multiply
   8,680.09x = 13,002.72 × 3,993.57
4. Step 4: Simplify right side
   8,680.09x = 51,927,272.51
5. Step 5: Solve for x
   x = 51,927,272.51/8,680.09
6. Step 6: Final answer
   x = 5,982.34