Finding the Fourth Proportional to 71.18, 98.25 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   71.18 : 98.25 = 42.09 : x
2. Step 2: Convert to fraction form
   71.18/98.25 = 42.09/x
3. Step 3: Cross multiply
   71.18x = 98.25 × 42.09
4. Step 4: Simplify right side
   71.18x = 4,134.82
5. Step 5: Solve for x
   x = 4,134.82/71.18
6. Step 6: Final answer
   x = 58.09