Finding the Fourth Proportional to 89.48, 122.72 and 79.76

Step by Step Solution

1. Step 1: Write the proportion equation
   89.48 : 122.72 = 79.76 : x
2. Step 2: Convert to fraction form
   89.48/122.72 = 79.76/x
3. Step 3: Cross multiply
   89.48x = 122.72 × 79.76
4. Step 4: Simplify right side
   89.48x = 9,788.15
5. Step 5: Solve for x
   x = 9,788.15/89.48
6. Step 6: Final answer
   x = 109.39