Finding the Fourth Proportional to 15,105.73, 20,844.76 and 8,390.79

Step by Step Solution

1. Step 1: Write the proportion equation
   15,105.73 : 20,844.76 = 8,390.79 : x
2. Step 2: Convert to fraction form
   15,105.73/20,844.76 = 8,390.79/x
3. Step 3: Cross multiply
   15,105.73x = 20,844.76 × 8,390.79
4. Step 4: Simplify right side
   15,105.73x = 174,904,003.76
5. Step 5: Solve for x
   x = 174,904,003.76/15,105.73
6. Step 6: Final answer
   x = 11,578.65