Finding the Fourth Proportional to 31,136.38, 43,014.98 and 20,406.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,136.38 : 43,014.98 = 20,406.71 : x
2. Step 2: Convert to fraction form
   31,136.38/43,014.98 = 20,406.71/x
3. Step 3: Cross multiply
   31,136.38x = 43,014.98 × 20,406.71
4. Step 4: Simplify right side
   31,136.38x = 877,794,222.52
5. Step 5: Solve for x
   x = 877,794,222.52/31,136.38
6. Step 6: Final answer
   x = 28,191.92