Finding the Fourth Proportional to 109.05, 163.69 and 57.69

Step by Step Solution

1. Step 1: Write the proportion equation
   109.05 : 163.69 = 57.69 : x
2. Step 2: Convert to fraction form
   109.05/163.69 = 57.69/x
3. Step 3: Cross multiply
   109.05x = 163.69 × 57.69
4. Step 4: Simplify right side
   109.05x = 9,442.31
5. Step 5: Solve for x
   x = 9,442.31/109.05
6. Step 6: Final answer
   x = 86.59