Finding the Fourth Proportional to 42.53, 63.71 and 35.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.53 : 63.71 = 35.31 : x
2. Step 2: Convert to fraction form
   42.53/63.71 = 35.31/x
3. Step 3: Cross multiply
   42.53x = 63.71 × 35.31
4. Step 4: Simplify right side
   42.53x = 2,249.72
5. Step 5: Solve for x
   x = 2,249.72/42.53
6. Step 6: Final answer
   x = 52.90