Finding the Fourth Proportional to 128.18, 192.18 and 93.89

Step by Step Solution

1. Step 1: Write the proportion equation
   128.18 : 192.18 = 93.89 : x
2. Step 2: Convert to fraction form
   128.18/192.18 = 93.89/x
3. Step 3: Cross multiply
   128.18x = 192.18 × 93.89
4. Step 4: Simplify right side
   128.18x = 18,042.82
5. Step 5: Solve for x
   x = 18,042.82/128.18
6. Step 6: Final answer
   x = 140.77