Finding the Fourth Proportional to 42.02, 63.18 and 28.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42.02 : 63.18 = 28.59 : x
2. Step 2: Convert to fraction form
   42.02/63.18 = 28.59/x
3. Step 3: Cross multiply
   42.02x = 63.18 × 28.59
4. Step 4: Simplify right side
   42.02x = 1,806.08
5. Step 5: Solve for x
   x = 1,806.08/42.02
6. Step 6: Final answer
   x = 42.98