Finding the Fourth Proportional to 20,564.37, 30,859.25 and 8,082.20

Step by Step Solution

1. Step 1: Write the proportion equation
   20,564.37 : 30,859.25 = 8,082.20 : x
2. Step 2: Convert to fraction form
   20,564.37/30,859.25 = 8,082.20/x
3. Step 3: Cross multiply
   20,564.37x = 30,859.25 × 8,082.20
4. Step 4: Simplify right side
   20,564.37x = 249,410,667.09
5. Step 5: Solve for x
   x = 249,410,667.09/20,564.37
6. Step 6: Final answer
   x = 12,128.29