Finding the Fourth Proportional to 9,158.93, 12,639.24 and 5,180.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.93 : 12,639.24 = 5,180.05 : x
2. Step 2: Convert to fraction form
   9,158.93/12,639.24 = 5,180.05/x
3. Step 3: Cross multiply
   9,158.93x = 12,639.24 × 5,180.05
4. Step 4: Simplify right side
   9,158.93x = 65,471,863.56
5. Step 5: Solve for x
   x = 65,471,863.56/9,158.93
6. Step 6: Final answer
   x = 7,148.42