Finding the Fourth Proportional to 2,072.98, 2,860.69 and 1,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.98 : 2,860.69 = 1,128.76 : x
2. Step 2: Convert to fraction form
   2,072.98/2,860.69 = 1,128.76/x
3. Step 3: Cross multiply
   2,072.98x = 2,860.69 × 1,128.76
4. Step 4: Simplify right side
   2,072.98x = 3,229,032.44
5. Step 5: Solve for x
   x = 3,229,032.44/2,072.98
6. Step 6: Final answer
   x = 1,557.68