Finding the Fourth Proportional to 89.63, 123.81 and 80.98

Step by Step Solution

1. Step 1: Write the proportion equation
   89.63 : 123.81 = 80.98 : x
2. Step 2: Convert to fraction form
   89.63/123.81 = 80.98/x
3. Step 3: Cross multiply
   89.63x = 123.81 × 80.98
4. Step 4: Simplify right side
   89.63x = 10,025.11
5. Step 5: Solve for x
   x = 10,025.11/89.63
6. Step 6: Final answer
   x = 111.85