Finding the Fourth Proportional to 128.89, 193.37 and 74.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128.89 : 193.37 = 74.83 : x
2. Step 2: Convert to fraction form
   128.89/193.37 = 74.83/x
3. Step 3: Cross multiply
   128.89x = 193.37 × 74.83
4. Step 4: Simplify right side
   128.89x = 14,469.50
5. Step 5: Solve for x
   x = 14,469.50/128.89
6. Step 6: Final answer
   x = 112.26