Finding the Fourth Proportional to 31,129.25, 42,958.37 and 19,951.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.25 : 42,958.37 = 19,951.25 : x
2. Step 2: Convert to fraction form
   31,129.25/42,958.37 = 19,951.25/x
3. Step 3: Cross multiply
   31,129.25x = 42,958.37 × 19,951.25
4. Step 4: Simplify right side
   31,129.25x = 857,073,079.71
5. Step 5: Solve for x
   x = 857,073,079.71/31,129.25
6. Step 6: Final answer
   x = 27,532.73