Finding the Fourth Proportional to 127.05, 190.61 and 91.05

Step by Step Solution

1. Step 1: Write the proportion equation
   127.05 : 190.61 = 91.05 : x
2. Step 2: Convert to fraction form
   127.05/190.61 = 91.05/x
3. Step 3: Cross multiply
   127.05x = 190.61 × 91.05
4. Step 4: Simplify right side
   127.05x = 17,354.59
5. Step 5: Solve for x
   x = 17,354.59/127.05
6. Step 6: Final answer
   x = 136.60