Finding the Fourth Proportional to 1,405.92, 1,940.28 and 908.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.92 : 1,940.28 = 908.64 : x
2. Step 2: Convert to fraction form
   1,405.92/1,940.28 = 908.64/x
3. Step 3: Cross multiply
   1,405.92x = 1,940.28 × 908.64
4. Step 4: Simplify right side
   1,405.92x = 1,763,016.02
5. Step 5: Solve for x
   x = 1,763,016.02/1,405.92
6. Step 6: Final answer
   x = 1,253.99