Finding the Fourth Proportional to 42.18, 63.32 and 35.43

Step by Step Solution

1. Step 1: Write the proportion equation
   42.18 : 63.32 = 35.43 : x
2. Step 2: Convert to fraction form
   42.18/63.32 = 35.43/x
3. Step 3: Cross multiply
   42.18x = 63.32 × 35.43
4. Step 4: Simplify right side
   42.18x = 2,243.25
5. Step 5: Solve for x
   x = 2,243.25/42.18
6. Step 6: Final answer
   x = 53.18