Finding the Fourth Proportional to 89.89, 134.27 and 77.74

Step by Step Solution

1. Step 1: Write the proportion equation
   89.89 : 134.27 = 77.74 : x
2. Step 2: Convert to fraction form
   89.89/134.27 = 77.74/x
3. Step 3: Cross multiply
   89.89x = 134.27 × 77.74
4. Step 4: Simplify right side
   89.89x = 10,438.25
5. Step 5: Solve for x
   x = 10,438.25/89.89
6. Step 6: Final answer
   x = 116.12