Finding the Fourth Proportional to 123.42, 184.89 and 89.13

Step by Step Solution

1. Step 1: Write the proportion equation
   123.42 : 184.89 = 89.13 : x
2. Step 2: Convert to fraction form
   123.42/184.89 = 89.13/x
3. Step 3: Cross multiply
   123.42x = 184.89 × 89.13
4. Step 4: Simplify right side
   123.42x = 16,479.25
5. Step 5: Solve for x
   x = 16,479.25/123.42
6. Step 6: Final answer
   x = 133.52