Finding the Fourth Proportional to 63.94, 88.25 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   63.94 : 88.25 = 42.15 : x
2. Step 2: Convert to fraction form
   63.94/88.25 = 42.15/x
3. Step 3: Cross multiply
   63.94x = 88.25 × 42.15
4. Step 4: Simplify right side
   63.94x = 3,719.53
5. Step 5: Solve for x
   x = 3,719.53/63.94
6. Step 6: Final answer
   x = 58.17