Finding the Fourth Proportional to 8,081.09, 12,128.94 and 3,404.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.09 : 12,128.94 = 3,404.57 : x
2. Step 2: Convert to fraction form
   8,081.09/12,128.94 = 3,404.57/x
3. Step 3: Cross multiply
   8,081.09x = 12,128.94 × 3,404.57
4. Step 4: Simplify right side
   8,081.09x = 41,293,825.26
5. Step 5: Solve for x
   x = 41,293,825.26/8,081.09
6. Step 6: Final answer
   x = 5,109.93