Finding the Fourth Proportional to 2,618.31, 3,613.27 and 1,439.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.31 : 3,613.27 = 1,439.46 : x
2. Step 2: Convert to fraction form
   2,618.31/3,613.27 = 1,439.46/x
3. Step 3: Cross multiply
   2,618.31x = 3,613.27 × 1,439.46
4. Step 4: Simplify right side
   2,618.31x = 5,201,157.63
5. Step 5: Solve for x
   x = 5,201,157.63/2,618.31
6. Step 6: Final answer
   x = 1,986.46