Finding the Fourth Proportional to 127.69, 191.49 and 55.50

Step by Step Solution

1. Step 1: Write the proportion equation
   127.69 : 191.49 = 55.50 : x
2. Step 2: Convert to fraction form
   127.69/191.49 = 55.50/x
3. Step 3: Cross multiply
   127.69x = 191.49 × 55.50
4. Step 4: Simplify right side
   127.69x = 10,627.42
5. Step 5: Solve for x
   x = 10,627.42/127.69
6. Step 6: Final answer
   x = 83.23