Finding the Fourth Proportional to 13,109.63, 18,086.15 and 8,635.73

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.63 : 18,086.15 = 8,635.73 : x
2. Step 2: Convert to fraction form
   13,109.63/18,086.15 = 8,635.73/x
3. Step 3: Cross multiply
   13,109.63x = 18,086.15 × 8,635.73
4. Step 4: Simplify right side
   13,109.63x = 156,187,039.30
5. Step 5: Solve for x
   x = 156,187,039.30/13,109.63
6. Step 6: Final answer
   x = 11,913.92