Finding the Fourth Proportional to 28.23, 42.31 and 10.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28.23 : 42.31 = 10.18 : x
2. Step 2: Convert to fraction form
   28.23/42.31 = 10.18/x
3. Step 3: Cross multiply
   28.23x = 42.31 × 10.18
4. Step 4: Simplify right side
   28.23x = 430.72
5. Step 5: Solve for x
   x = 430.72/28.23
6. Step 6: Final answer
   x = 15.26