Finding the Fourth Proportional to 127.45, 191.18 and 55.31

Step by Step Solution

1. Step 1: Write the proportion equation
   127.45 : 191.18 = 55.31 : x
2. Step 2: Convert to fraction form
   127.45/191.18 = 55.31/x
3. Step 3: Cross multiply
   127.45x = 191.18 × 55.31
4. Step 4: Simplify right side
   127.45x = 10,573.96
5. Step 5: Solve for x
   x = 10,573.96/127.45
6. Step 6: Final answer
   x = 82.96