Finding the Fourth Proportional to 128.83, 193.17 and 109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   128.83 : 193.17 = 109.69 : x
2. Step 2: Convert to fraction form
   128.83/193.17 = 109.69/x
3. Step 3: Cross multiply
   128.83x = 193.17 × 109.69
4. Step 4: Simplify right side
   128.83x = 21,188.82
5. Step 5: Solve for x
   x = 21,188.82/128.83
6. Step 6: Final answer
   x = 164.47