Finding the Fourth Proportional to 13,159.05, 18,158.72 and 7,189.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,159.05 : 18,158.72 = 7,189.53 : x
2. Step 2: Convert to fraction form
   13,159.05/18,158.72 = 7,189.53/x
3. Step 3: Cross multiply
   13,159.05x = 18,158.72 × 7,189.53
4. Step 4: Simplify right side
   13,159.05x = 130,552,626.25
5. Step 5: Solve for x
   x = 130,552,626.25/13,159.05
6. Step 6: Final answer
   x = 9,921.13