Finding the Fourth Proportional to 31,039.33, 42,804.49 and 20,853.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,039.33 : 42,804.49 = 20,853.37 : x
2. Step 2: Convert to fraction form
   31,039.33/42,804.49 = 20,853.37/x
3. Step 3: Cross multiply
   31,039.33x = 42,804.49 × 20,853.37
4. Step 4: Simplify right side
   31,039.33x = 892,617,867.63
5. Step 5: Solve for x
   x = 892,617,867.63/31,039.33
6. Step 6: Final answer
   x = 28,757.64