Finding the Fourth Proportional to 42.72, 58.98 and 31.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 58.98 = 31.87 : x
2. Step 2: Convert to fraction form
   42.72/58.98 = 31.87/x
3. Step 3: Cross multiply
   42.72x = 58.98 × 31.87
4. Step 4: Simplify right side
   42.72x = 1,879.69
5. Step 5: Solve for x
   x = 1,879.69/42.72
6. Step 6: Final answer
   x = 44.00