Finding the Fourth Proportional to 128.10, 176.73 and 72.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128.10 : 176.73 = 72.83 : x
2. Step 2: Convert to fraction form
   128.10/176.73 = 72.83/x
3. Step 3: Cross multiply
   128.10x = 176.73 × 72.83
4. Step 4: Simplify right side
   128.10x = 12,871.25
5. Step 5: Solve for x
   x = 12,871.25/128.10
6. Step 6: Final answer
   x = 100.48