Finding the Fourth Proportional to 11,255.79, 16,887.33 and 5,411.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,255.79 : 16,887.33 = 5,411.64 : x
2. Step 2: Convert to fraction form
   11,255.79/16,887.33 = 5,411.64/x
3. Step 3: Cross multiply
   11,255.79x = 16,887.33 × 5,411.64
4. Step 4: Simplify right side
   11,255.79x = 91,388,150.52
5. Step 5: Solve for x
   x = 91,388,150.52/11,255.79
6. Step 6: Final answer
   x = 8,119.21