Finding the Fourth Proportional to 42.48, 58.71 and 39.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.48 : 58.71 = 39.18 : x
2. Step 2: Convert to fraction form
   42.48/58.71 = 39.18/x
3. Step 3: Cross multiply
   42.48x = 58.71 × 39.18
4. Step 4: Simplify right side
   42.48x = 2,300.26
5. Step 5: Solve for x
   x = 2,300.26/42.48
6. Step 6: Final answer
   x = 54.15