Finding the Fourth Proportional to 21,216.20, 29,251.33 and 13,255.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,216.20 : 29,251.33 = 13,255.52 : x
2. Step 2: Convert to fraction form
   21,216.20/29,251.33 = 13,255.52/x
3. Step 3: Cross multiply
   21,216.20x = 29,251.33 × 13,255.52
4. Step 4: Simplify right side
   21,216.20x = 387,741,410.45
5. Step 5: Solve for x
   x = 387,741,410.45/21,216.20
6. Step 6: Final answer
   x = 18,275.73