Finding the Fourth Proportional to 123.98, 186.24 and 89.96

Step by Step Solution

1. Step 1: Write the proportion equation
   123.98 : 186.24 = 89.96 : x
2. Step 2: Convert to fraction form
   123.98/186.24 = 89.96/x
3. Step 3: Cross multiply
   123.98x = 186.24 × 89.96
4. Step 4: Simplify right side
   123.98x = 16,754.15
5. Step 5: Solve for x
   x = 16,754.15/123.98
6. Step 6: Final answer
   x = 135.14