Finding the Fourth Proportional to 20,424.51, 30,581.69 and 14,171.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,424.51 : 30,581.69 = 14,171.31 : x
2. Step 2: Convert to fraction form
   20,424.51/30,581.69 = 14,171.31/x
3. Step 3: Cross multiply
   20,424.51x = 30,581.69 × 14,171.31
4. Step 4: Simplify right side
   20,424.51x = 433,382,538.46
5. Step 5: Solve for x
   x = 433,382,538.46/20,424.51
6. Step 6: Final answer
   x = 21,218.75