Finding the Fourth Proportional to 9,158.24, 12,638.23 and 5,179.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.24 : 12,638.23 = 5,179.21 : x
2. Step 2: Convert to fraction form
   9,158.24/12,638.23 = 5,179.21/x
3. Step 3: Cross multiply
   9,158.24x = 12,638.23 × 5,179.21
4. Step 4: Simplify right side
   9,158.24x = 65,456,002.65
5. Step 5: Solve for x
   x = 65,456,002.65/9,158.24
6. Step 6: Final answer
   x = 7,147.22