Finding the Fourth Proportional to 42.09, 63.06 and 28.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42.09 : 63.06 = 28.58 : x
2. Step 2: Convert to fraction form
   42.09/63.06 = 28.58/x
3. Step 3: Cross multiply
   42.09x = 63.06 × 28.58
4. Step 4: Simplify right side
   42.09x = 1,802.25
5. Step 5: Solve for x
   x = 1,802.25/42.09
6. Step 6: Final answer
   x = 42.82