Finding the Fourth Proportional to 13,419.73, 18,519.12 and 7,451.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,419.73 : 18,519.12 = 7,451.42 : x
2. Step 2: Convert to fraction form
   13,419.73/18,519.12 = 7,451.42/x
3. Step 3: Cross multiply
   13,419.73x = 18,519.12 × 7,451.42
4. Step 4: Simplify right side
   13,419.73x = 137,993,648.55
5. Step 5: Solve for x
   x = 137,993,648.55/13,419.73
6. Step 6: Final answer
   x = 10,282.90