Finding the Fourth Proportional to 90.97, 125.82 and 80.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.97 : 125.82 = 80.05 : x
2. Step 2: Convert to fraction form
   90.97/125.82 = 80.05/x
3. Step 3: Cross multiply
   90.97x = 125.82 × 80.05
4. Step 4: Simplify right side
   90.97x = 10,071.89
5. Step 5: Solve for x
   x = 10,071.89/90.97
6. Step 6: Final answer
   x = 110.72