Finding the Fourth Proportional to 89.94, 123.84 and 80.76

Step by Step Solution

1. Step 1: Write the proportion equation
   89.94 : 123.84 = 80.76 : x
2. Step 2: Convert to fraction form
   89.94/123.84 = 80.76/x
3. Step 3: Cross multiply
   89.94x = 123.84 × 80.76
4. Step 4: Simplify right side
   89.94x = 10,001.32
5. Step 5: Solve for x
   x = 10,001.32/89.94
6. Step 6: Final answer
   x = 111.20