Finding the Fourth Proportional to 28.62, 42.72 and 28.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28.62 : 42.72 = 28.02 : x
2. Step 2: Convert to fraction form
   28.62/42.72 = 28.02/x
3. Step 3: Cross multiply
   28.62x = 42.72 × 28.02
4. Step 4: Simplify right side
   28.62x = 1,197.01
5. Step 5: Solve for x
   x = 1,197.01/28.62
6. Step 6: Final answer
   x = 41.82