Finding the Fourth Proportional to 127.98, 191.79 and 111.78

Step by Step Solution

1. Step 1: Write the proportion equation
   127.98 : 191.79 = 111.78 : x
2. Step 2: Convert to fraction form
   127.98/191.79 = 111.78/x
3. Step 3: Cross multiply
   127.98x = 191.79 × 111.78
4. Step 4: Simplify right side
   127.98x = 21,438.29
5. Step 5: Solve for x
   x = 21,438.29/127.98
6. Step 6: Final answer
   x = 167.51