Finding the Fourth Proportional to 128.49, 192.52 and 89.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128.49 : 192.52 = 89.83 : x
2. Step 2: Convert to fraction form
   128.49/192.52 = 89.83/x
3. Step 3: Cross multiply
   128.49x = 192.52 × 89.83
4. Step 4: Simplify right side
   128.49x = 17,294.07
5. Step 5: Solve for x
   x = 17,294.07/128.49
6. Step 6: Final answer
   x = 134.59