Finding the Fourth Proportional to 103.50, 155.18 and 42.57

Step by Step Solution

1. Step 1: Write the proportion equation
   103.50 : 155.18 = 42.57 : x
2. Step 2: Convert to fraction form
   103.50/155.18 = 42.57/x
3. Step 3: Cross multiply
   103.50x = 155.18 × 42.57
4. Step 4: Simplify right side
   103.50x = 6,605.02
5. Step 5: Solve for x
   x = 6,605.02/103.50
6. Step 6: Final answer
   x = 63.82