Finding the Fourth Proportional to 11,105.10, 16,653.60 and 3,311.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.10 : 16,653.60 = 3,311.28 : x
2. Step 2: Convert to fraction form
   11,105.10/16,653.60 = 3,311.28/x
3. Step 3: Cross multiply
   11,105.10x = 16,653.60 × 3,311.28
4. Step 4: Simplify right side
   11,105.10x = 55,144,732.61
5. Step 5: Solve for x
   x = 55,144,732.61/11,105.10
6. Step 6: Final answer
   x = 4,965.71