Finding the Fourth Proportional to 42.06, 57.98 and 31.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42.06 : 57.98 = 31.14 : x
2. Step 2: Convert to fraction form
   42.06/57.98 = 31.14/x
3. Step 3: Cross multiply
   42.06x = 57.98 × 31.14
4. Step 4: Simplify right side
   42.06x = 1,805.50
5. Step 5: Solve for x
   x = 1,805.50/42.06
6. Step 6: Final answer
   x = 42.93