Finding the Fourth Proportional to 13,519.94, 18,636.33 and 12,433.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,519.94 : 18,636.33 = 12,433.72 : x
2. Step 2: Convert to fraction form
   13,519.94/18,636.33 = 12,433.72/x
3. Step 3: Cross multiply
   13,519.94x = 18,636.33 × 12,433.72
4. Step 4: Simplify right side
   13,519.94x = 231,718,909.05
5. Step 5: Solve for x
   x = 231,718,909.05/13,519.94
6. Step 6: Final answer
   x = 17,139.05