Finding the Fourth Proportional to 2,580.12, 3,869.91 and 1,019.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.12 : 3,869.91 = 1,019.79 : x
2. Step 2: Convert to fraction form
   2,580.12/3,869.91 = 1,019.79/x
3. Step 3: Cross multiply
   2,580.12x = 3,869.91 × 1,019.79
4. Step 4: Simplify right side
   2,580.12x = 3,946,495.52
5. Step 5: Solve for x
   x = 3,946,495.52/2,580.12
6. Step 6: Final answer
   x = 1,529.58