Finding the Fourth Proportional to 31.05, 42.82 and 23.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31.05 : 42.82 = 23.79 : x
2. Step 2: Convert to fraction form
   31.05/42.82 = 23.79/x
3. Step 3: Cross multiply
   31.05x = 42.82 × 23.79
4. Step 4: Simplify right side
   31.05x = 1,018.69
5. Step 5: Solve for x
   x = 1,018.69/31.05
6. Step 6: Final answer
   x = 32.81