Finding the Fourth Proportional to 1,379.97, 1,903.46 and 908.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.97 : 1,903.46 = 908.30 : x
2. Step 2: Convert to fraction form
   1,379.97/1,903.46 = 908.30/x
3. Step 3: Cross multiply
   1,379.97x = 1,903.46 × 908.30
4. Step 4: Simplify right side
   1,379.97x = 1,728,912.72
5. Step 5: Solve for x
   x = 1,728,912.72/1,379.97
6. Step 6: Final answer
   x = 1,252.86