Finding the Fourth Proportional to 128.82, 192.87 and 67.82

Step by Step Solution

1. Step 1: Write the proportion equation
   128.82 : 192.87 = 67.82 : x
2. Step 2: Convert to fraction form
   128.82/192.87 = 67.82/x
3. Step 3: Cross multiply
   128.82x = 192.87 × 67.82
4. Step 4: Simplify right side
   128.82x = 13,079.48
5. Step 5: Solve for x
   x = 13,079.48/128.82
6. Step 6: Final answer
   x = 101.53