Finding the Fourth Proportional to 21,380.48, 29,506.56 and 13,928.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,380.48 : 29,506.56 = 13,928.48 : x
2. Step 2: Convert to fraction form
   21,380.48/29,506.56 = 13,928.48/x
3. Step 3: Cross multiply
   21,380.48x = 29,506.56 × 13,928.48
4. Step 4: Simplify right side
   21,380.48x = 410,981,530.83
5. Step 5: Solve for x
   x = 410,981,530.83/21,380.48
6. Step 6: Final answer
   x = 19,222.28