Finding the Fourth Proportional to 100.69, 150.88 and 89.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100.69 : 150.88 = 89.88 : x
2. Step 2: Convert to fraction form
   100.69/150.88 = 89.88/x
3. Step 3: Cross multiply
   100.69x = 150.88 × 89.88
4. Step 4: Simplify right side
   100.69x = 13,560.34
5. Step 5: Solve for x
   x = 13,560.34/100.69
6. Step 6: Final answer
   x = 134.68