Finding the Fourth Proportional to 127.10, 190.50 and 90.53

Step by Step Solution

1. Step 1: Write the proportion equation
   127.10 : 190.50 = 90.53 : x
2. Step 2: Convert to fraction form
   127.10/190.50 = 90.53/x
3. Step 3: Cross multiply
   127.10x = 190.50 × 90.53
4. Step 4: Simplify right side
   127.10x = 17,245.01
5. Step 5: Solve for x
   x = 17,245.01/127.10
6. Step 6: Final answer
   x = 135.69