Finding the Fourth Proportional to 2,012.20, 2,776.95 and 1,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.20 : 2,776.95 = 1,128.28 : x
2. Step 2: Convert to fraction form
   2,012.20/2,776.95 = 1,128.28/x
3. Step 3: Cross multiply
   2,012.20x = 2,776.95 × 1,128.28
4. Step 4: Simplify right side
   2,012.20x = 3,133,171.50
5. Step 5: Solve for x
   x = 3,133,171.50/2,012.20
6. Step 6: Final answer
   x = 1,557.09