Finding the Fourth Proportional to 128.82, 193.62 and 103.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128.82 : 193.62 = 103.34 : x
2. Step 2: Convert to fraction form
   128.82/193.62 = 103.34/x
3. Step 3: Cross multiply
   128.82x = 193.62 × 103.34
4. Step 4: Simplify right side
   128.82x = 20,008.69
5. Step 5: Solve for x
   x = 20,008.69/128.82
6. Step 6: Final answer
   x = 155.32