Finding the Fourth Proportional to 1,960.28, 2,938.55 and 905.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,960.28 : 2,938.55 = 905.03 : x
2. Step 2: Convert to fraction form
   1,960.28/2,938.55 = 905.03/x
3. Step 3: Cross multiply
   1,960.28x = 2,938.55 × 905.03
4. Step 4: Simplify right side
   1,960.28x = 2,659,456.69
5. Step 5: Solve for x
   x = 2,659,456.69/1,960.28
6. Step 6: Final answer
   x = 1,356.68