Finding the Fourth Proportional to 11,405.16, 17,105.16 and 3,609.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,405.16 : 17,105.16 = 3,609.72 : x
2. Step 2: Convert to fraction form
   11,405.16/17,105.16 = 3,609.72/x
3. Step 3: Cross multiply
   11,405.16x = 17,105.16 × 3,609.72
4. Step 4: Simplify right side
   11,405.16x = 61,744,838.16
5. Step 5: Solve for x
   x = 61,744,838.16/11,405.16
6. Step 6: Final answer
   x = 5,413.76