Finding the Fourth Proportional to 28.69, 42.69 and 28.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28.69 : 42.69 = 28.05 : x
2. Step 2: Convert to fraction form
   28.69/42.69 = 28.05/x
3. Step 3: Cross multiply
   28.69x = 42.69 × 28.05
4. Step 4: Simplify right side
   28.69x = 1,197.40
5. Step 5: Solve for x
   x = 1,197.40/28.69
6. Step 6: Final answer
   x = 41.74