Finding the Fourth Proportional to 71.21, 98.25 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   71.21 : 98.25 = 42.10 : x
2. Step 2: Convert to fraction form
   71.21/98.25 = 42.10/x
3. Step 3: Cross multiply
   71.21x = 98.25 × 42.10
4. Step 4: Simplify right side
   71.21x = 4,136.33
5. Step 5: Solve for x
   x = 4,136.33/71.21
6. Step 6: Final answer
   x = 58.09