Finding the Fourth Proportional to 2,618.35, 3,613.32 and 1,439.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.35 : 3,613.32 = 1,439.51 : x
2. Step 2: Convert to fraction form
   2,618.35/3,613.32 = 1,439.51/x
3. Step 3: Cross multiply
   2,618.35x = 3,613.32 × 1,439.51
4. Step 4: Simplify right side
   2,618.35x = 5,201,392.21
5. Step 5: Solve for x
   x = 5,201,392.21/2,618.35
6. Step 6: Final answer
   x = 1,986.52