Finding the Fourth Proportional to 71.29, 98.37 and 42.16

Step by Step Solution

1. Step 1: Write the proportion equation
   71.29 : 98.37 = 42.16 : x
2. Step 2: Convert to fraction form
   71.29/98.37 = 42.16/x
3. Step 3: Cross multiply
   71.29x = 98.37 × 42.16
4. Step 4: Simplify right side
   71.29x = 4,147.28
5. Step 5: Solve for x
   x = 4,147.28/71.29
6. Step 6: Final answer
   x = 58.17