Finding the Fourth Proportional to 99.67, 150.06 and 89.75

Step by Step Solution

1. Step 1: Write the proportion equation
   99.67 : 150.06 = 89.75 : x
2. Step 2: Convert to fraction form
   99.67/150.06 = 89.75/x
3. Step 3: Cross multiply
   99.67x = 150.06 × 89.75
4. Step 4: Simplify right side
   99.67x = 13,467.89
5. Step 5: Solve for x
   x = 13,467.89/99.67
6. Step 6: Final answer
   x = 135.12