Finding the Fourth Proportional to 2,618.86, 3,613.98 and 1,439.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.86 : 3,613.98 = 1,439.92 : x
2. Step 2: Convert to fraction form
   2,618.86/3,613.98 = 1,439.92/x
3. Step 3: Cross multiply
   2,618.86x = 3,613.98 × 1,439.92
4. Step 4: Simplify right side
   2,618.86x = 5,203,842.08
5. Step 5: Solve for x
   x = 5,203,842.08/2,618.86
6. Step 6: Final answer
   x = 1,987.06