Finding the Fourth Proportional to 20,804.18, 28,710.33 and 12,425.54

Step by Step Solution

1. Step 1: Write the proportion equation
   20,804.18 : 28,710.33 = 12,425.54 : x
2. Step 2: Convert to fraction form
   20,804.18/28,710.33 = 12,425.54/x
3. Step 3: Cross multiply
   20,804.18x = 28,710.33 × 12,425.54
4. Step 4: Simplify right side
   20,804.18x = 356,741,353.83
5. Step 5: Solve for x
   x = 356,741,353.83/20,804.18
6. Step 6: Final answer
   x = 17,147.58