Finding the Fourth Proportional to 31,138.75, 42,956.89 and 18,383.24

Step by Step Solution

1. Step 1: Write the proportion equation
   31,138.75 : 42,956.89 = 18,383.24 : x
2. Step 2: Convert to fraction form
   31,138.75/42,956.89 = 18,383.24/x
3. Step 3: Cross multiply
   31,138.75x = 42,956.89 × 18,383.24
4. Step 4: Simplify right side
   31,138.75x = 789,686,902.82
5. Step 5: Solve for x
   x = 789,686,902.82/31,138.75
6. Step 6: Final answer
   x = 25,360.27