Finding the Fourth Proportional to 2,143.27, 3,215.25 and 910.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.27 : 3,215.25 = 910.69 : x
2. Step 2: Convert to fraction form
   2,143.27/3,215.25 = 910.69/x
3. Step 3: Cross multiply
   2,143.27x = 3,215.25 × 910.69
4. Step 4: Simplify right side
   2,143.27x = 2,928,087.98
5. Step 5: Solve for x
   x = 2,928,087.98/2,143.27
6. Step 6: Final answer
   x = 1,366.18