Finding the Fourth Proportional to 89.98, 134.61 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   89.98 : 134.61 = 71.98 : x
2. Step 2: Convert to fraction form
   89.98/134.61 = 71.98/x
3. Step 3: Cross multiply
   89.98x = 134.61 × 71.98
4. Step 4: Simplify right side
   89.98x = 9,689.23
5. Step 5: Solve for x
   x = 9,689.23/89.98
6. Step 6: Final answer
   x = 107.68