Finding the Fourth Proportional to 42.24, 63.18 and 31.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42.24 : 63.18 = 31.98 : x
2. Step 2: Convert to fraction form
   42.24/63.18 = 31.98/x
3. Step 3: Cross multiply
   42.24x = 63.18 × 31.98
4. Step 4: Simplify right side
   42.24x = 2,020.50
5. Step 5: Solve for x
   x = 2,020.50/42.24
6. Step 6: Final answer
   x = 47.83