Finding the Fourth Proportional to 11,408.72, 17,115.60 and 3,511.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,408.72 : 17,115.60 = 3,511.28 : x
2. Step 2: Convert to fraction form
   11,408.72/17,115.60 = 3,511.28/x
3. Step 3: Cross multiply
   11,408.72x = 17,115.60 × 3,511.28
4. Step 4: Simplify right side
   11,408.72x = 60,097,663.97
5. Step 5: Solve for x
   x = 60,097,663.97/11,408.72
6. Step 6: Final answer
   x = 5,267.70