Finding the Fourth Proportional to 42.72, 58.95 and 23.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 58.95 = 23.31 : x
2. Step 2: Convert to fraction form
   42.72/58.95 = 23.31/x
3. Step 3: Cross multiply
   42.72x = 58.95 × 23.31
4. Step 4: Simplify right side
   42.72x = 1,374.33
5. Step 5: Solve for x
   x = 1,374.33/42.72
6. Step 6: Final answer
   x = 32.17