Finding the Fourth Proportional to 42.10, 63.12 and 18.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42.10 : 63.12 = 18.06 : x
2. Step 2: Convert to fraction form
   42.10/63.12 = 18.06/x
3. Step 3: Cross multiply
   42.10x = 63.12 × 18.06
4. Step 4: Simplify right side
   42.10x = 1,139.95
5. Step 5: Solve for x
   x = 1,139.95/42.10
6. Step 6: Final answer
   x = 27.08