Finding the Fourth Proportional to 301.86, 452.71 and 128.54

Step by Step Solution

1. Step 1: Write the proportion equation
   301.86 : 452.71 = 128.54 : x
2. Step 2: Convert to fraction form
   301.86/452.71 = 128.54/x
3. Step 3: Cross multiply
   301.86x = 452.71 × 128.54
4. Step 4: Simplify right side
   301.86x = 58,191.34
5. Step 5: Solve for x
   x = 58,191.34/301.86
6. Step 6: Final answer
   x = 192.78