Finding the Fourth Proportional to 63.89, 88.15 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   63.89 : 88.15 = 42.09 : x
2. Step 2: Convert to fraction form
   63.89/88.15 = 42.09/x
3. Step 3: Cross multiply
   63.89x = 88.15 × 42.09
4. Step 4: Simplify right side
   63.89x = 3,710.23
5. Step 5: Solve for x
   x = 3,710.23/63.89
6. Step 6: Final answer
   x = 58.07