Finding the Fourth Proportional to 42.95, 59.30 and 28.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42.95 : 59.30 = 28.42 : x
2. Step 2: Convert to fraction form
   42.95/59.30 = 28.42/x
3. Step 3: Cross multiply
   42.95x = 59.30 × 28.42
4. Step 4: Simplify right side
   42.95x = 1,685.12
5. Step 5: Solve for x
   x = 1,685.12/42.95
6. Step 6: Final answer
   x = 39.23