Finding the Fourth Proportional to 89.84, 134.70 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   89.84 : 134.70 = 72.69 : x
2. Step 2: Convert to fraction form
   89.84/134.70 = 72.69/x
3. Step 3: Cross multiply
   89.84x = 134.70 × 72.69
4. Step 4: Simplify right side
   89.84x = 9,791.34
5. Step 5: Solve for x
   x = 9,791.34/89.84
6. Step 6: Final answer
   x = 108.99