Finding the Fourth Proportional to 31,081.37, 42,884.78 and 20,324.97

Step by Step Solution

1. Step 1: Write the proportion equation
   31,081.37 : 42,884.78 = 20,324.97 : x
2. Step 2: Convert to fraction form
   31,081.37/42,884.78 = 20,324.97/x
3. Step 3: Cross multiply
   31,081.37x = 42,884.78 × 20,324.97
4. Step 4: Simplify right side
   31,081.37x = 871,631,765.33
5. Step 5: Solve for x
   x = 871,631,765.33/31,081.37
6. Step 6: Final answer
   x = 28,043.55