Finding the Fourth Proportional to 11,405.78, 17,103.20 and 5,856.26

Step by Step Solution

1. Step 1: Write the proportion equation
   11,405.78 : 17,103.20 = 5,856.26 : x
2. Step 2: Convert to fraction form
   11,405.78/17,103.20 = 5,856.26/x
3. Step 3: Cross multiply
   11,405.78x = 17,103.20 × 5,856.26
4. Step 4: Simplify right side
   11,405.78x = 100,160,799.51
5. Step 5: Solve for x
   x = 100,160,799.51/11,405.78
6. Step 6: Final answer
   x = 8,781.59