Finding the Fourth Proportional to 20,164.78, 30,228.72 and 8,478.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,164.78 : 30,228.72 = 8,478.82 : x
2. Step 2: Convert to fraction form
   20,164.78/30,228.72 = 8,478.82/x
3. Step 3: Cross multiply
   20,164.78x = 30,228.72 × 8,478.82
4. Step 4: Simplify right side
   20,164.78x = 256,303,875.71
5. Step 5: Solve for x
   x = 256,303,875.71/20,164.78
6. Step 6: Final answer
   x = 12,710.47