Finding the Fourth Proportional to 42.22, 58.31 and 34.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42.22 : 58.31 = 34.12 : x
2. Step 2: Convert to fraction form
   42.22/58.31 = 34.12/x
3. Step 3: Cross multiply
   42.22x = 58.31 × 34.12
4. Step 4: Simplify right side
   42.22x = 1,989.54
5. Step 5: Solve for x
   x = 1,989.54/42.22
6. Step 6: Final answer
   x = 47.12