Finding the Fourth Proportional to 21,057.24, 29,056.52 and 12,559.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,057.24 : 29,056.52 = 12,559.82 : x
2. Step 2: Convert to fraction form
   21,057.24/29,056.52 = 12,559.82/x
3. Step 3: Cross multiply
   21,057.24x = 29,056.52 × 12,559.82
4. Step 4: Simplify right side
   21,057.24x = 364,944,661.03
5. Step 5: Solve for x
   x = 364,944,661.03/21,057.24
6. Step 6: Final answer
   x = 17,331.08