Finding the Fourth Proportional to 42.72, 63.89 and 35.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 63.89 = 35.49 : x
2. Step 2: Convert to fraction form
   42.72/63.89 = 35.49/x
3. Step 3: Cross multiply
   42.72x = 63.89 × 35.49
4. Step 4: Simplify right side
   42.72x = 2,267.46
5. Step 5: Solve for x
   x = 2,267.46/42.72
6. Step 6: Final answer
   x = 53.08