Finding the Fourth Proportional to 1,401.84, 1,934.55 and 905.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.84 : 1,934.55 = 905.40 : x
2. Step 2: Convert to fraction form
   1,401.84/1,934.55 = 905.40/x
3. Step 3: Cross multiply
   1,401.84x = 1,934.55 × 905.40
4. Step 4: Simplify right side
   1,401.84x = 1,751,541.57
5. Step 5: Solve for x
   x = 1,751,541.57/1,401.84
6. Step 6: Final answer
   x = 1,249.46