Finding the Fourth Proportional to 10,139.24, 13,991.04 and 5,891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.24 : 13,991.04 = 5,891.72 : x
2. Step 2: Convert to fraction form
   10,139.24/13,991.04 = 5,891.72/x
3. Step 3: Cross multiply
   10,139.24x = 13,991.04 × 5,891.72
4. Step 4: Simplify right side
   10,139.24x = 82,431,290.19
5. Step 5: Solve for x
   x = 82,431,290.19/10,139.24
6. Step 6: Final answer
   x = 8,129.93