Finding the Fourth Proportional to 63.98, 88.35 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   63.98 : 88.35 = 42.17 : x
2. Step 2: Convert to fraction form
   63.98/88.35 = 42.17/x
3. Step 3: Cross multiply
   63.98x = 88.35 × 42.17
4. Step 4: Simplify right side
   63.98x = 3,725.72
5. Step 5: Solve for x
   x = 3,725.72/63.98
6. Step 6: Final answer
   x = 58.23