Finding the Fourth Proportional to 71.31, 98.42 and 42.22

Step by Step Solution

1. Step 1: Write the proportion equation
   71.31 : 98.42 = 42.22 : x
2. Step 2: Convert to fraction form
   71.31/98.42 = 42.22/x
3. Step 3: Cross multiply
   71.31x = 98.42 × 42.22
4. Step 4: Simplify right side
   71.31x = 4,155.29
5. Step 5: Solve for x
   x = 4,155.29/71.31
6. Step 6: Final answer
   x = 58.27