Finding the Fourth Proportional to 1,098.29, 1,513.69 and 910.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.29 : 1,513.69 = 910.78 : x
2. Step 2: Convert to fraction form
   1,098.29/1,513.69 = 910.78/x
3. Step 3: Cross multiply
   1,098.29x = 1,513.69 × 910.78
4. Step 4: Simplify right side
   1,098.29x = 1,378,632.52
5. Step 5: Solve for x
   x = 1,378,632.52/1,098.29
6. Step 6: Final answer
   x = 1,255.25