Finding the Fourth Proportional to 1,426.49, 2,139.33 and 905.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.49 : 2,139.33 = 905.71 : x
2. Step 2: Convert to fraction form
   1,426.49/2,139.33 = 905.71/x
3. Step 3: Cross multiply
   1,426.49x = 2,139.33 × 905.71
4. Step 4: Simplify right side
   1,426.49x = 1,937,612.57
5. Step 5: Solve for x
   x = 1,937,612.57/1,426.49
6. Step 6: Final answer
   x = 1,358.31