Finding the Fourth Proportional to 20,559.41, 28,372.24 and 12,061.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,559.41 : 28,372.24 = 12,061.09 : x
2. Step 2: Convert to fraction form
   20,559.41/28,372.24 = 12,061.09/x
3. Step 3: Cross multiply
   20,559.41x = 28,372.24 × 12,061.09
4. Step 4: Simplify right side
   20,559.41x = 342,200,140.14
5. Step 5: Solve for x
   x = 342,200,140.14/20,559.41
6. Step 6: Final answer
   x = 16,644.45