Finding the Fourth Proportional to 1,402.84, 1,936.37 and 905.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.84 : 1,936.37 = 905.09 : x
2. Step 2: Convert to fraction form
   1,402.84/1,936.37 = 905.09/x
3. Step 3: Cross multiply
   1,402.84x = 1,936.37 × 905.09
4. Step 4: Simplify right side
   1,402.84x = 1,752,589.44
5. Step 5: Solve for x
   x = 1,752,589.44/1,402.84
6. Step 6: Final answer
   x = 1,249.32