Finding the Fourth Proportional to 31,163.96, 42,973.52 and 20,540

Step by Step Solution

1. Step 1: Write the proportion equation
   31,163.96 : 42,973.52 = 20,540 : x
2. Step 2: Convert to fraction form
   31,163.96/42,973.52 = 20,540/x
3. Step 3: Cross multiply
   31,163.96x = 42,973.52 × 20,540
4. Step 4: Simplify right side
   31,163.96x = 882,676,100.80
5. Step 5: Solve for x
   x = 882,676,100.80/31,163.96
6. Step 6: Final answer
   x = 28,323.62