Finding the Fourth Proportional to 128.01, 191.83 and 89.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128.01 : 191.83 = 89.43 : x
2. Step 2: Convert to fraction form
   128.01/191.83 = 89.43/x
3. Step 3: Cross multiply
   128.01x = 191.83 × 89.43
4. Step 4: Simplify right side
   128.01x = 17,155.36
5. Step 5: Solve for x
   x = 17,155.36/128.01
6. Step 6: Final answer
   x = 134.02