Finding the Fourth Proportional to 13,485.11, 18,610.83 and 8,109.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,485.11 : 18,610.83 = 8,109.27 : x
2. Step 2: Convert to fraction form
   13,485.11/18,610.83 = 8,109.27/x
3. Step 3: Cross multiply
   13,485.11x = 18,610.83 × 8,109.27
4. Step 4: Simplify right side
   13,485.11x = 150,920,245.39
5. Step 5: Solve for x
   x = 150,920,245.39/13,485.11
6. Step 6: Final answer
   x = 11,191.63