Finding the Fourth Proportional to 28.52, 42.72 and 15.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28.52 : 42.72 = 15.02 : x
2. Step 2: Convert to fraction form
   28.52/42.72 = 15.02/x
3. Step 3: Cross multiply
   28.52x = 42.72 × 15.02
4. Step 4: Simplify right side
   28.52x = 641.65
5. Step 5: Solve for x
   x = 641.65/28.52
6. Step 6: Final answer
   x = 22.50