Finding the Fourth Proportional to 31,030.27, 42,771.98 and 20,955.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,030.27 : 42,771.98 = 20,955.49 : x
2. Step 2: Convert to fraction form
   31,030.27/42,771.98 = 20,955.49/x
3. Step 3: Cross multiply
   31,030.27x = 42,771.98 × 20,955.49
4. Step 4: Simplify right side
   31,030.27x = 896,307,480.53
5. Step 5: Solve for x
   x = 896,307,480.53/31,030.27
6. Step 6: Final answer
   x = 28,884.94