Finding the Fourth Proportional to 42.19, 63.29 and 28.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42.19 : 63.29 = 28.49 : x
2. Step 2: Convert to fraction form
   42.19/63.29 = 28.49/x
3. Step 3: Cross multiply
   42.19x = 63.29 × 28.49
4. Step 4: Simplify right side
   42.19x = 1,802.89
5. Step 5: Solve for x
   x = 1,802.89/42.19
6. Step 6: Final answer
   x = 42.74