Finding the Fourth Proportional to 42.05, 58 and 33.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.05 : 58 = 33.31 : x
2. Step 2: Convert to fraction form
   42.05/58 = 33.31/x
3. Step 3: Cross multiply
   42.05x = 58 × 33.31
4. Step 4: Simplify right side
   42.05x = 1,931.98
5. Step 5: Solve for x
   x = 1,931.98/42.05
6. Step 6: Final answer
   x = 45.94