Finding the Fourth Proportional to 20,776.71, 31,176.41 and 12,028.71

Step by Step Solution

1. Step 1: Write the proportion equation
   20,776.71 : 31,176.41 = 12,028.71 : x
2. Step 2: Convert to fraction form
   20,776.71/31,176.41 = 12,028.71/x
3. Step 3: Cross multiply
   20,776.71x = 31,176.41 × 12,028.71
4. Step 4: Simplify right side
   20,776.71x = 375,011,934.59
5. Step 5: Solve for x
   x = 375,011,934.59/20,776.71
6. Step 6: Final answer
   x = 18,049.63