Finding the Fourth Proportional to 89.94, 134.34 and 79.86

Step by Step Solution

1. Step 1: Write the proportion equation
   89.94 : 134.34 = 79.86 : x
2. Step 2: Convert to fraction form
   89.94/134.34 = 79.86/x
3. Step 3: Cross multiply
   89.94x = 134.34 × 79.86
4. Step 4: Simplify right side
   89.94x = 10,728.39
5. Step 5: Solve for x
   x = 10,728.39/89.94
6. Step 6: Final answer
   x = 119.28