Finding the Fourth Proportional to 42.01, 63.01 and 18.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42.01 : 63.01 = 18.87 : x
2. Step 2: Convert to fraction form
   42.01/63.01 = 18.87/x
3. Step 3: Cross multiply
   42.01x = 63.01 × 18.87
4. Step 4: Simplify right side
   42.01x = 1,189.02
5. Step 5: Solve for x
   x = 1,189.02/42.01
6. Step 6: Final answer
   x = 28.31