Finding the Fourth Proportional to 2,618.46, 3,613.39 and 1,439.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.46 : 3,613.39 = 1,439.53 : x
2. Step 2: Convert to fraction form
   2,618.46/3,613.39 = 1,439.53/x
3. Step 3: Cross multiply
   2,618.46x = 3,613.39 × 1,439.53
4. Step 4: Simplify right side
   2,618.46x = 5,201,583.31
5. Step 5: Solve for x
   x = 5,201,583.31/2,618.46
6. Step 6: Final answer
   x = 1,986.50