Finding the Fourth Proportional to 1,403.84, 1,935.81 and 905.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.84 : 1,935.81 = 905.49 : x
2. Step 2: Convert to fraction form
   1,403.84/1,935.81 = 905.49/x
3. Step 3: Cross multiply
   1,403.84x = 1,935.81 × 905.49
4. Step 4: Simplify right side
   1,403.84x = 1,752,856.60
5. Step 5: Solve for x
   x = 1,752,856.60/1,403.84
6. Step 6: Final answer
   x = 1,248.62