Finding the Fourth Proportional to 1,013.42, 1,399.17 and 908.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.42 : 1,399.17 = 908.31 : x
2. Step 2: Convert to fraction form
   1,013.42/1,399.17 = 908.31/x
3. Step 3: Cross multiply
   1,013.42x = 1,399.17 × 908.31
4. Step 4: Simplify right side
   1,013.42x = 1,270,880.10
5. Step 5: Solve for x
   x = 1,270,880.10/1,013.42
6. Step 6: Final answer
   x = 1,254.06