Finding the Fourth Proportional to 127.98, 191.63 and 89.38

Step by Step Solution

1. Step 1: Write the proportion equation
   127.98 : 191.63 = 89.38 : x
2. Step 2: Convert to fraction form
   127.98/191.63 = 89.38/x
3. Step 3: Cross multiply
   127.98x = 191.63 × 89.38
4. Step 4: Simplify right side
   127.98x = 17,127.89
5. Step 5: Solve for x
   x = 17,127.89/127.98
6. Step 6: Final answer
   x = 133.83