Finding the Fourth Proportional to 11,015.48, 16,517.72 and 3,995.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,015.48 : 16,517.72 = 3,995.20 : x
2. Step 2: Convert to fraction form
   11,015.48/16,517.72 = 3,995.20/x
3. Step 3: Cross multiply
   11,015.48x = 16,517.72 × 3,995.20
4. Step 4: Simplify right side
   11,015.48x = 65,991,594.94
5. Step 5: Solve for x
   x = 65,991,594.94/11,015.48
6. Step 6: Final answer
   x = 5,990.81