Finding the Fourth Proportional to 9,158.16, 12,639.04 and 5,179.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.16 : 12,639.04 = 5,179.98 : x
2. Step 2: Convert to fraction form
   9,158.16/12,639.04 = 5,179.98/x
3. Step 3: Cross multiply
   9,158.16x = 12,639.04 × 5,179.98
4. Step 4: Simplify right side
   9,158.16x = 65,469,974.42
5. Step 5: Solve for x
   x = 65,469,974.42/9,158.16
6. Step 6: Final answer
   x = 7,148.81