Finding the Fourth Proportional to 42.87, 64.59 and 35.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42.87 : 64.59 = 35.42 : x
2. Step 2: Convert to fraction form
   42.87/64.59 = 35.42/x
3. Step 3: Cross multiply
   42.87x = 64.59 × 35.42
4. Step 4: Simplify right side
   42.87x = 2,287.78
5. Step 5: Solve for x
   x = 2,287.78/42.87
6. Step 6: Final answer
   x = 53.37