Finding the Fourth Proportional to 11,013.08, 16,521.28 and 3,993.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,013.08 : 16,521.28 = 3,993.60 : x
2. Step 2: Convert to fraction form
   11,013.08/16,521.28 = 3,993.60/x
3. Step 3: Cross multiply
   11,013.08x = 16,521.28 × 3,993.60
4. Step 4: Simplify right side
   11,013.08x = 65,979,383.81
5. Step 5: Solve for x
   x = 65,979,383.81/11,013.08
6. Step 6: Final answer
   x = 5,991.00