Finding the Fourth Proportional to 2,209.59, 3,315.26 and 910.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.59 : 3,315.26 = 910.76 : x
2. Step 2: Convert to fraction form
   2,209.59/3,315.26 = 910.76/x
3. Step 3: Cross multiply
   2,209.59x = 3,315.26 × 910.76
4. Step 4: Simplify right side
   2,209.59x = 3,019,391.90
5. Step 5: Solve for x
   x = 3,019,391.90/2,209.59
6. Step 6: Final answer
   x = 1,366.49