Finding the Fourth Proportional to 13,105.37, 18,086.17 and 9,869.39

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.37 : 18,086.17 = 9,869.39 : x
2. Step 2: Convert to fraction form
   13,105.37/18,086.17 = 9,869.39/x
3. Step 3: Cross multiply
   13,105.37x = 18,086.17 × 9,869.39
4. Step 4: Simplify right side
   13,105.37x = 178,499,485.88
5. Step 5: Solve for x
   x = 178,499,485.88/13,105.37
6. Step 6: Final answer
   x = 13,620.34