Finding the Fourth Proportional to 21,751.28, 30,016.24 and 12,799.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,751.28 : 30,016.24 = 12,799.36 : x
2. Step 2: Convert to fraction form
   21,751.28/30,016.24 = 12,799.36/x
3. Step 3: Cross multiply
   21,751.28x = 30,016.24 × 12,799.36
4. Step 4: Simplify right side
   21,751.28x = 384,188,661.61
5. Step 5: Solve for x
   x = 384,188,661.61/21,751.28
6. Step 6: Final answer
   x = 17,662.81