Finding the Fourth Proportional to 15,105.94, 20,845.89 and 8,391.38

Step by Step Solution

1. Step 1: Write the proportion equation
   15,105.94 : 20,845.89 = 8,391.38 : x
2. Step 2: Convert to fraction form
   15,105.94/20,845.89 = 8,391.38/x
3. Step 3: Cross multiply
   15,105.94x = 20,845.89 × 8,391.38
4. Step 4: Simplify right side
   15,105.94x = 174,925,680.20
5. Step 5: Solve for x
   x = 174,925,680.20/15,105.94
6. Step 6: Final answer
   x = 11,579.93