Finding the Fourth Proportional to 11,413.20, 17,118.72 and 3,621.36

Step by Step Solution

1. Step 1: Write the proportion equation
   11,413.20 : 17,118.72 = 3,621.36 : x
2. Step 2: Convert to fraction form
   11,413.20/17,118.72 = 3,621.36/x
3. Step 3: Cross multiply
   11,413.20x = 17,118.72 × 3,621.36
4. Step 4: Simplify right side
   11,413.20x = 61,993,047.86
5. Step 5: Solve for x
   x = 61,993,047.86/11,413.20
6. Step 6: Final answer
   x = 5,431.70