Finding the Fourth Proportional to 12,109.55, 18,164.20 and 7,175.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.55 : 18,164.20 = 7,175.64 : x
2. Step 2: Convert to fraction form
   12,109.55/18,164.20 = 7,175.64/x
3. Step 3: Cross multiply
   12,109.55x = 18,164.20 × 7,175.64
4. Step 4: Simplify right side
   12,109.55x = 130,339,760.09
5. Step 5: Solve for x
   x = 130,339,760.09/12,109.55
6. Step 6: Final answer
   x = 10,763.39