Finding the Fourth Proportional to 71.51, 98.71 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71.51 : 98.71 = 42.42 : x
2. Step 2: Convert to fraction form
   71.51/98.71 = 42.42/x
3. Step 3: Cross multiply
   71.51x = 98.71 × 42.42
4. Step 4: Simplify right side
   71.51x = 4,187.17
5. Step 5: Solve for x
   x = 4,187.17/71.51
6. Step 6: Final answer
   x = 58.55