Finding the Fourth Proportional to 2,599.98, 3,900.69 and 1,040.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,599.98 : 3,900.69 = 1,040.10 : x
2. Step 2: Convert to fraction form
   2,599.98/3,900.69 = 1,040.10/x
3. Step 3: Cross multiply
   2,599.98x = 3,900.69 × 1,040.10
4. Step 4: Simplify right side
   2,599.98x = 4,057,107.67
5. Step 5: Solve for x
   x = 4,057,107.67/2,599.98
6. Step 6: Final answer
   x = 1,560.44