Finding the Fourth Proportional to 13,405.82, 20,108.78 and 5,609.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.82 : 20,108.78 = 5,609.16 : x
2. Step 2: Convert to fraction form
   13,405.82/20,108.78 = 5,609.16/x
3. Step 3: Cross multiply
   13,405.82x = 20,108.78 × 5,609.16
4. Step 4: Simplify right side
   13,405.82x = 112,793,336.38
5. Step 5: Solve for x
   x = 112,793,336.38/13,405.82
6. Step 6: Final answer
   x = 8,413.76