Finding the Fourth Proportional to 89.98, 124.12 and 88.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89.98 : 124.12 = 88.18 : x
2. Step 2: Convert to fraction form
   89.98/124.12 = 88.18/x
3. Step 3: Cross multiply
   89.98x = 124.12 × 88.18
4. Step 4: Simplify right side
   89.98x = 10,944.90
5. Step 5: Solve for x
   x = 10,944.90/89.98
6. Step 6: Final answer
   x = 121.64