Finding the Fourth Proportional to 2,229.81, 3,075.62 and 1,298.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.81 : 3,075.62 = 1,298.31 : x
2. Step 2: Convert to fraction form
   2,229.81/3,075.62 = 1,298.31/x
3. Step 3: Cross multiply
   2,229.81x = 3,075.62 × 1,298.31
4. Step 4: Simplify right side
   2,229.81x = 3,993,101.71
5. Step 5: Solve for x
   x = 3,993,101.71/2,229.81
6. Step 6: Final answer
   x = 1,790.78