Finding the Fourth Proportional to 89.05, 132.93 and 78.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89.05 : 132.93 = 78.25 : x
2. Step 2: Convert to fraction form
   89.05/132.93 = 78.25/x
3. Step 3: Cross multiply
   89.05x = 132.93 × 78.25
4. Step 4: Simplify right side
   89.05x = 10,401.77
5. Step 5: Solve for x
   x = 10,401.77/89.05
6. Step 6: Final answer
   x = 116.81