Finding the Fourth Proportional to 2,143.18, 3,215.10 and 910.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.18 : 3,215.10 = 910.59 : x
2. Step 2: Convert to fraction form
   2,143.18/3,215.10 = 910.59/x
3. Step 3: Cross multiply
   2,143.18x = 3,215.10 × 910.59
4. Step 4: Simplify right side
   2,143.18x = 2,927,653.38
5. Step 5: Solve for x
   x = 2,927,653.38/2,143.18
6. Step 6: Final answer
   x = 1,366.03