Finding the Fourth Proportional to 42.82, 64.23 and 28.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.82 : 64.23 = 28.18 : x
2. Step 2: Convert to fraction form
   42.82/64.23 = 28.18/x
3. Step 3: Cross multiply
   42.82x = 64.23 × 28.18
4. Step 4: Simplify right side
   42.82x = 1,810.00
5. Step 5: Solve for x
   x = 1,810.00/42.82
6. Step 6: Final answer
   x = 42.27