Finding the Fourth Proportional to 13,728.75, 20,585.33 and 5,404.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,728.75 : 20,585.33 = 5,404.26 : x
2. Step 2: Convert to fraction form
   13,728.75/20,585.33 = 5,404.26/x
3. Step 3: Cross multiply
   13,728.75x = 20,585.33 × 5,404.26
4. Step 4: Simplify right side
   13,728.75x = 111,248,345.56
5. Step 5: Solve for x
   x = 111,248,345.56/13,728.75
6. Step 6: Final answer
   x = 8,103.31