Finding the Fourth Proportional to 2,688.89, 4,034.89 and 1,128.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.89 : 4,034.89 = 1,128.75 : x
2. Step 2: Convert to fraction form
   2,688.89/4,034.89 = 1,128.75/x
3. Step 3: Cross multiply
   2,688.89x = 4,034.89 × 1,128.75
4. Step 4: Simplify right side
   2,688.89x = 4,554,382.09
5. Step 5: Solve for x
   x = 4,554,382.09/2,688.89
6. Step 6: Final answer
   x = 1,693.78