Finding the Fourth Proportional to 13,158.55, 18,158.25 and 7,190.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.55 : 18,158.25 = 7,190.42 : x
2. Step 2: Convert to fraction form
   13,158.55/18,158.25 = 7,190.42/x
3. Step 3: Cross multiply
   13,158.55x = 18,158.25 × 7,190.42
4. Step 4: Simplify right side
   13,158.55x = 130,565,443.97
5. Step 5: Solve for x
   x = 130,565,443.97/13,158.55
6. Step 6: Final answer
   x = 9,922.48