Finding the Fourth Proportional to 13,814.82, 20,728.42 and 7,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,814.82 : 20,728.42 = 7,239.50 : x
2. Step 2: Convert to fraction form
   13,814.82/20,728.42 = 7,239.50/x
3. Step 3: Cross multiply
   13,814.82x = 20,728.42 × 7,239.50
4. Step 4: Simplify right side
   13,814.82x = 150,063,396.59
5. Step 5: Solve for x
   x = 150,063,396.59/13,814.82
6. Step 6: Final answer
   x = 10,862.49