Finding the Fourth Proportional to 2,773.20, 4,158.12 and 1,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,773.20 : 4,158.12 = 1,128.88 : x
2. Step 2: Convert to fraction form
   2,773.20/4,158.12 = 1,128.88/x
3. Step 3: Cross multiply
   2,773.20x = 4,158.12 × 1,128.88
4. Step 4: Simplify right side
   2,773.20x = 4,694,018.51
5. Step 5: Solve for x
   x = 4,694,018.51/2,773.20
6. Step 6: Final answer
   x = 1,692.64