Finding the Fourth Proportional to 71.55, 98.70 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71.55 : 98.70 = 42.42 : x
2. Step 2: Convert to fraction form
   71.55/98.70 = 42.42/x
3. Step 3: Cross multiply
   71.55x = 98.70 × 42.42
4. Step 4: Simplify right side
   71.55x = 4,186.85
5. Step 5: Solve for x
   x = 4,186.85/71.55
6. Step 6: Final answer
   x = 58.52