Finding the Fourth Proportional to 2,580.26, 3,870.43 and 1,019.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.26 : 3,870.43 = 1,019.60 : x
2. Step 2: Convert to fraction form
   2,580.26/3,870.43 = 1,019.60/x
3. Step 3: Cross multiply
   2,580.26x = 3,870.43 × 1,019.60
4. Step 4: Simplify right side
   2,580.26x = 3,946,268.53
5. Step 5: Solve for x
   x = 3,946,268.53/2,580.26
6. Step 6: Final answer
   x = 1,529.41