Finding the Fourth Proportional to 13,517.82, 18,519.10 and 13,012.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,517.82 : 18,519.10 = 13,012.43 : x
2. Step 2: Convert to fraction form
   13,517.82/18,519.10 = 13,012.43/x
3. Step 3: Cross multiply
   13,517.82x = 18,519.10 × 13,012.43
4. Step 4: Simplify right side
   13,517.82x = 240,978,508.05
5. Step 5: Solve for x
   x = 240,978,508.05/13,517.82
6. Step 6: Final answer
   x = 17,826.73