Finding the Fourth Proportional to 2,013.90, 3,019.35 and 1,040.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.90 : 3,019.35 = 1,040.70 : x
2. Step 2: Convert to fraction form
   2,013.90/3,019.35 = 1,040.70/x
3. Step 3: Cross multiply
   2,013.90x = 3,019.35 × 1,040.70
4. Step 4: Simplify right side
   2,013.90x = 3,142,237.55
5. Step 5: Solve for x
   x = 3,142,237.55/2,013.90
6. Step 6: Final answer
   x = 1,560.27