Finding the Fourth Proportional to 31,152.88, 42,939.76 and 22,081.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,152.88 : 42,939.76 = 22,081.28 : x
2. Step 2: Convert to fraction form
   31,152.88/42,939.76 = 22,081.28/x
3. Step 3: Cross multiply
   31,152.88x = 42,939.76 × 22,081.28
4. Step 4: Simplify right side
   31,152.88x = 948,164,863.69
5. Step 5: Solve for x
   x = 948,164,863.69/31,152.88
6. Step 6: Final answer
   x = 30,435.87