Finding the Fourth Proportional to 31,339.48, 43,255.74 and 20,142.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,339.48 : 43,255.74 = 20,142.04 : x
2. Step 2: Convert to fraction form
   31,339.48/43,255.74 = 20,142.04/x
3. Step 3: Cross multiply
   31,339.48x = 43,255.74 × 20,142.04
4. Step 4: Simplify right side
   31,339.48x = 871,258,845.31
5. Step 5: Solve for x
   x = 871,258,845.31/31,339.48
6. Step 6: Final answer
   x = 27,800.68