Finding the Fourth Proportional to 127.14, 190.71 and 91.10

Step by Step Solution

1. Step 1: Write the proportion equation
   127.14 : 190.71 = 91.10 : x
2. Step 2: Convert to fraction form
   127.14/190.71 = 91.10/x
3. Step 3: Cross multiply
   127.14x = 190.71 × 91.10
4. Step 4: Simplify right side
   127.14x = 17,372.73
5. Step 5: Solve for x
   x = 17,372.73/127.14
6. Step 6: Final answer
   x = 136.64