Finding the Fourth Proportional to 89.30, 123.34 and 80.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89.30 : 123.34 = 80.10 : x
2. Step 2: Convert to fraction form
   89.30/123.34 = 80.10/x
3. Step 3: Cross multiply
   89.30x = 123.34 × 80.10
4. Step 4: Simplify right side
   89.30x = 9,879.53
5. Step 5: Solve for x
   x = 9,879.53/89.30
6. Step 6: Final answer
   x = 110.63