Finding the Fourth Proportional to 42.42, 63.67 and 28.00

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 63.67 = 28.00 : x
2. Step 2: Convert to fraction form
   42.42/63.67 = 28.00/x
3. Step 3: Cross multiply
   42.42x = 63.67 × 28.00
4. Step 4: Simplify right side
   42.42x = 1,782.46
5. Step 5: Solve for x
   x = 1,782.46/42.42
6. Step 6: Final answer
   x = 42.02