Finding the Fourth Proportional to 105.51, 158.25 and 28.47

Step by Step Solution

1. Step 1: Write the proportion equation
   105.51 : 158.25 = 28.47 : x
2. Step 2: Convert to fraction form
   105.51/158.25 = 28.47/x
3. Step 3: Cross multiply
   105.51x = 158.25 × 28.47
4. Step 4: Simplify right side
   105.51x = 4,505.23
5. Step 5: Solve for x
   x = 4,505.23/105.51
6. Step 6: Final answer
   x = 42.70