Finding the Fourth Proportional to 8,681.72, 13,016.78 and 3,995.39

Step by Step Solution

1. Step 1: Write the proportion equation
   8,681.72 : 13,016.78 = 3,995.39 : x
2. Step 2: Convert to fraction form
   8,681.72/13,016.78 = 3,995.39/x
3. Step 3: Cross multiply
   8,681.72x = 13,016.78 × 3,995.39
4. Step 4: Simplify right side
   8,681.72x = 52,007,155.17
5. Step 5: Solve for x
   x = 52,007,155.17/8,681.72
6. Step 6: Final answer
   x = 5,990.42