Finding the Fourth Proportional to 28.63, 42.71 and 28.09

Step by Step Solution

1. Step 1: Write the proportion equation
   28.63 : 42.71 = 28.09 : x
2. Step 2: Convert to fraction form
   28.63/42.71 = 28.09/x
3. Step 3: Cross multiply
   28.63x = 42.71 × 28.09
4. Step 4: Simplify right side
   28.63x = 1,199.72
5. Step 5: Solve for x
   x = 1,199.72/28.63
6. Step 6: Final answer
   x = 41.90