Finding the Fourth Proportional to 2,580.05, 3,868.71 and 1,019.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.05 : 3,868.71 = 1,019.99 : x
2. Step 2: Convert to fraction form
   2,580.05/3,868.71 = 1,019.99/x
3. Step 3: Cross multiply
   2,580.05x = 3,868.71 × 1,019.99
4. Step 4: Simplify right side
   2,580.05x = 3,946,057.10
5. Step 5: Solve for x
   x = 3,946,057.10/2,580.05
6. Step 6: Final answer
   x = 1,529.45