Finding the Fourth Proportional to 13,105.69, 18,086.18 and 7,137.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.69 : 18,086.18 = 7,137.69 : x
2. Step 2: Convert to fraction form
   13,105.69/18,086.18 = 7,137.69/x
3. Step 3: Cross multiply
   13,105.69x = 18,086.18 × 7,137.69
4. Step 4: Simplify right side
   13,105.69x = 129,093,546.12
5. Step 5: Solve for x
   x = 129,093,546.12/13,105.69
6. Step 6: Final answer
   x = 9,850.19