Finding the Fourth Proportional to 2,618.52, 3,613.48 and 1,439.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.52 : 3,613.48 = 1,439.60 : x
2. Step 2: Convert to fraction form
   2,618.52/3,613.48 = 1,439.60/x
3. Step 3: Cross multiply
   2,618.52x = 3,613.48 × 1,439.60
4. Step 4: Simplify right side
   2,618.52x = 5,201,965.81
5. Step 5: Solve for x
   x = 5,201,965.81/2,618.52
6. Step 6: Final answer
   x = 1,986.61