Finding the Fourth Proportional to 1,279.81, 1,910.37 and 1,098.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.81 : 1,910.37 = 1,098.37 : x
2. Step 2: Convert to fraction form
   1,279.81/1,910.37 = 1,098.37/x
3. Step 3: Cross multiply
   1,279.81x = 1,910.37 × 1,098.37
4. Step 4: Simplify right side
   1,279.81x = 2,098,293.10
5. Step 5: Solve for x
   x = 2,098,293.10/1,279.81
6. Step 6: Final answer
   x = 1,639.53