Finding the Fourth Proportional to 31,548.72, 43,514.89 and 20,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,548.72 : 43,514.89 = 20,221.42 : x
2. Step 2: Convert to fraction form
   31,548.72/43,514.89 = 20,221.42/x
3. Step 3: Cross multiply
   31,548.72x = 43,514.89 × 20,221.42
4. Step 4: Simplify right side
   31,548.72x = 879,932,866.94
5. Step 5: Solve for x
   x = 879,932,866.94/31,548.72
6. Step 6: Final answer
   x = 27,891.24