Finding the Fourth Proportional to 100.49, 150.53 and 89.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100.49 : 150.53 = 89.96 : x
2. Step 2: Convert to fraction form
   100.49/150.53 = 89.96/x
3. Step 3: Cross multiply
   100.49x = 150.53 × 89.96
4. Step 4: Simplify right side
   100.49x = 13,540.48
5. Step 5: Solve for x
   x = 13,540.48/100.49
6. Step 6: Final answer
   x = 134.75