Finding the Fourth Proportional to 2,618.81, 3,613.97 and 1,439.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.81 : 3,613.97 = 1,439.86 : x
2. Step 2: Convert to fraction form
   2,618.81/3,613.97 = 1,439.86/x
3. Step 3: Cross multiply
   2,618.81x = 3,613.97 × 1,439.86
4. Step 4: Simplify right side
   2,618.81x = 5,203,594.61
5. Step 5: Solve for x
   x = 5,203,594.61/2,618.81
6. Step 6: Final answer
   x = 1,987.01