Finding the Fourth Proportional to 42.31, 58.33 and 34.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42.31 : 58.33 = 34.49 : x
2. Step 2: Convert to fraction form
   42.31/58.33 = 34.49/x
3. Step 3: Cross multiply
   42.31x = 58.33 × 34.49
4. Step 4: Simplify right side
   42.31x = 2,011.80
5. Step 5: Solve for x
   x = 2,011.80/42.31
6. Step 6: Final answer
   x = 47.55