Finding the Fourth Proportional to 2,012.72, 3,020.70 and 1,039.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.72 : 3,020.70 = 1,039.10 : x
2. Step 2: Convert to fraction form
   2,012.72/3,020.70 = 1,039.10/x
3. Step 3: Cross multiply
   2,012.72x = 3,020.70 × 1,039.10
4. Step 4: Simplify right side
   2,012.72x = 3,138,794.27
5. Step 5: Solve for x
   x = 3,138,794.27/2,012.72
6. Step 6: Final answer
   x = 1,559.48