Finding the Fourth Proportional to 71.39, 98.52 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   71.39 : 98.52 = 42.28 : x
2. Step 2: Convert to fraction form
   71.39/98.52 = 42.28/x
3. Step 3: Cross multiply
   71.39x = 98.52 × 42.28
4. Step 4: Simplify right side
   71.39x = 4,165.71
5. Step 5: Solve for x
   x = 4,165.71/71.39
6. Step 6: Final answer
   x = 58.35