Finding the Fourth Proportional to 8,384.09, 12,579.78 and 5,791.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,384.09 : 12,579.78 = 5,791.28 : x
2. Step 2: Convert to fraction form
   8,384.09/12,579.78 = 5,791.28/x
3. Step 3: Cross multiply
   8,384.09x = 12,579.78 × 5,791.28
4. Step 4: Simplify right side
   8,384.09x = 72,853,028.32
5. Step 5: Solve for x
   x = 72,853,028.32/8,384.09
6. Step 6: Final answer
   x = 8,689.44