Finding the Fourth Proportional to 127.43, 190.73 and 83.99

Step by Step Solution

1. Step 1: Write the proportion equation
   127.43 : 190.73 = 83.99 : x
2. Step 2: Convert to fraction form
   127.43/190.73 = 83.99/x
3. Step 3: Cross multiply
   127.43x = 190.73 × 83.99
4. Step 4: Simplify right side
   127.43x = 16,020.10
5. Step 5: Solve for x
   x = 16,020.10/127.43
6. Step 6: Final answer
   x = 125.72