Finding the Fourth Proportional to 101.98, 152.18 and 89.68

Step by Step Solution

1. Step 1: Write the proportion equation
   101.98 : 152.18 = 89.68 : x
2. Step 2: Convert to fraction form
   101.98/152.18 = 89.68/x
3. Step 3: Cross multiply
   101.98x = 152.18 × 89.68
4. Step 4: Simplify right side
   101.98x = 13,647.72
5. Step 5: Solve for x
   x = 13,647.72/101.98
6. Step 6: Final answer
   x = 133.82