Finding the Fourth Proportional to 127.42, 190.93 and 90.72

Step by Step Solution

1. Step 1: Write the proportion equation
   127.42 : 190.93 = 90.72 : x
2. Step 2: Convert to fraction form
   127.42/190.93 = 90.72/x
3. Step 3: Cross multiply
   127.42x = 190.93 × 90.72
4. Step 4: Simplify right side
   127.42x = 17,321.37
5. Step 5: Solve for x
   x = 17,321.37/127.42
6. Step 6: Final answer
   x = 135.94