Finding the Fourth Proportional to 128.05, 176.71 and 69.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128.05 : 176.71 = 69.83 : x
2. Step 2: Convert to fraction form
   128.05/176.71 = 69.83/x
3. Step 3: Cross multiply
   128.05x = 176.71 × 69.83
4. Step 4: Simplify right side
   128.05x = 12,339.31
5. Step 5: Solve for x
   x = 12,339.31/128.05
6. Step 6: Final answer
   x = 96.36