Finding the Fourth Proportional to 42.23, 63.33 and 28.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42.23 : 63.33 = 28.72 : x
2. Step 2: Convert to fraction form
   42.23/63.33 = 28.72/x
3. Step 3: Cross multiply
   42.23x = 63.33 × 28.72
4. Step 4: Simplify right side
   42.23x = 1,818.81
5. Step 5: Solve for x
   x = 1,818.81/42.23
6. Step 6: Final answer
   x = 43.07