Finding the Fourth Proportional to 15,105.27, 20,844.69 and 8,391.33

Step by Step Solution

1. Step 1: Write the proportion equation
   15,105.27 : 20,844.69 = 8,391.33 : x
2. Step 2: Convert to fraction form
   15,105.27/20,844.69 = 8,391.33/x
3. Step 3: Cross multiply
   15,105.27x = 20,844.69 × 8,391.33
4. Step 4: Simplify right side
   15,105.27x = 174,914,672.54
5. Step 5: Solve for x
   x = 174,914,672.54/15,105.27
6. Step 6: Final answer
   x = 11,579.71