Finding the Fourth Proportional to 2,072.28, 2,859.78 and 1,140.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.28 : 2,859.78 = 1,140.78 : x
2. Step 2: Convert to fraction form
   2,072.28/2,859.78 = 1,140.78/x
3. Step 3: Cross multiply
   2,072.28x = 2,859.78 × 1,140.78
4. Step 4: Simplify right side
   2,072.28x = 3,262,379.83
5. Step 5: Solve for x
   x = 3,262,379.83/2,072.28
6. Step 6: Final answer
   x = 1,574.29