Finding the Fourth Proportional to 71.69, 98.93 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   71.69 : 98.93 = 42.18 : x
2. Step 2: Convert to fraction form
   71.69/98.93 = 42.18/x
3. Step 3: Cross multiply
   71.69x = 98.93 × 42.18
4. Step 4: Simplify right side
   71.69x = 4,173.03
5. Step 5: Solve for x
   x = 4,173.03/71.69
6. Step 6: Final answer
   x = 58.21