Finding the Fourth Proportional to 42.88, 63.89 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 63.89 = 42.28 : x
2. Step 2: Convert to fraction form
   42.88/63.89 = 42.28/x
3. Step 3: Cross multiply
   42.88x = 63.89 × 42.28
4. Step 4: Simplify right side
   42.88x = 2,701.27
5. Step 5: Solve for x
   x = 2,701.27/42.88
6. Step 6: Final answer
   x = 63.00