Finding the Fourth Proportional to 128.55, 191.83 and 114.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128.55 : 191.83 = 114.88 : x
2. Step 2: Convert to fraction form
   128.55/191.83 = 114.88/x
3. Step 3: Cross multiply
   128.55x = 191.83 × 114.88
4. Step 4: Simplify right side
   128.55x = 22,036.47
5. Step 5: Solve for x
   x = 22,036.47/128.55
6. Step 6: Final answer
   x = 171.42