Finding the Fourth Proportional to 42.42, 63.58 and 28.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 63.58 = 28.87 : x
2. Step 2: Convert to fraction form
   42.42/63.58 = 28.87/x
3. Step 3: Cross multiply
   42.42x = 63.58 × 28.87
4. Step 4: Simplify right side
   42.42x = 1,835.55
5. Step 5: Solve for x
   x = 1,835.55/42.42
6. Step 6: Final answer
   x = 43.27