Finding the Fourth Proportional to 13,105.72, 18,086.22 and 7,137.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.72 : 18,086.22 = 7,137.72 : x
2. Step 2: Convert to fraction form
   13,105.72/18,086.22 = 7,137.72/x
3. Step 3: Cross multiply
   13,105.72x = 18,086.22 × 7,137.72
4. Step 4: Simplify right side
   13,105.72x = 129,094,374.22
5. Step 5: Solve for x
   x = 129,094,374.22/13,105.72
6. Step 6: Final answer
   x = 9,850.23