Finding the Fourth Proportional to 20,559.48, 30,812.34 and 8,256.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,559.48 : 30,812.34 = 8,256.12 : x
2. Step 2: Convert to fraction form
   20,559.48/30,812.34 = 8,256.12/x
3. Step 3: Cross multiply
   20,559.48x = 30,812.34 × 8,256.12
4. Step 4: Simplify right side
   20,559.48x = 254,390,376.52
5. Step 5: Solve for x
   x = 254,390,376.52/20,559.48
6. Step 6: Final answer
   x = 12,373.39