Finding the Fourth Proportional to 2,688.42, 4,030.63 and 1,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.42 : 4,030.63 = 1,128.88 : x
2. Step 2: Convert to fraction form
   2,688.42/4,030.63 = 1,128.88/x
3. Step 3: Cross multiply
   2,688.42x = 4,030.63 × 1,128.88
4. Step 4: Simplify right side
   2,688.42x = 4,550,097.59
5. Step 5: Solve for x
   x = 4,550,097.59/2,688.42
6. Step 6: Final answer
   x = 1,692.48