Finding the Fourth Proportional to 21,303.14, 31,939.59 and 8,144.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,303.14 : 31,939.59 = 8,144.42 : x
2. Step 2: Convert to fraction form
   21,303.14/31,939.59 = 8,144.42/x
3. Step 3: Cross multiply
   21,303.14x = 31,939.59 × 8,144.42
4. Step 4: Simplify right side
   21,303.14x = 260,129,435.59
5. Step 5: Solve for x
   x = 260,129,435.59/21,303.14
6. Step 6: Final answer
   x = 12,210.85