Finding the Fourth Proportional to 72.42, 108.63 and 28.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 108.63 = 28.50 : x
2. Step 2: Convert to fraction form
   72.42/108.63 = 28.50/x
3. Step 3: Cross multiply
   72.42x = 108.63 × 28.50
4. Step 4: Simplify right side
   72.42x = 3,095.65
5. Step 5: Solve for x
   x = 3,095.65/72.42
6. Step 6: Final answer
   x = 42.74