Finding the Fourth Proportional to 31,144.52, 42,964.49 and 20,384.65

Step by Step Solution

1. Step 1: Write the proportion equation
   31,144.52 : 42,964.49 = 20,384.65 : x
2. Step 2: Convert to fraction form
   31,144.52/42,964.49 = 20,384.65/x
3. Step 3: Cross multiply
   31,144.52x = 42,964.49 × 20,384.65
4. Step 4: Simplify right side
   31,144.52x = 875,816,103.28
5. Step 5: Solve for x
   x = 875,816,103.28/31,144.52
6. Step 6: Final answer
   x = 28,121.04