Finding the Fourth Proportional to 2,688.75, 4,032.38 and 1,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.75 : 4,032.38 = 1,128.42 : x
2. Step 2: Convert to fraction form
   2,688.75/4,032.38 = 1,128.42/x
3. Step 3: Cross multiply
   2,688.75x = 4,032.38 × 1,128.42
4. Step 4: Simplify right side
   2,688.75x = 4,550,221.06
5. Step 5: Solve for x
   x = 4,550,221.06/2,688.75
6. Step 6: Final answer
   x = 1,692.32