Finding the Fourth Proportional to 128.10, 176.72 and 103.52

Step by Step Solution

1. Step 1: Write the proportion equation
   128.10 : 176.72 = 103.52 : x
2. Step 2: Convert to fraction form
   128.10/176.72 = 103.52/x
3. Step 3: Cross multiply
   128.10x = 176.72 × 103.52
4. Step 4: Simplify right side
   128.10x = 18,294.05
5. Step 5: Solve for x
   x = 18,294.05/128.10
6. Step 6: Final answer
   x = 142.81