Finding the Fourth Proportional to 2,012.19, 2,776.94 and 1,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.19 : 2,776.94 = 1,128.28 : x
2. Step 2: Convert to fraction form
   2,012.19/2,776.94 = 1,128.28/x
3. Step 3: Cross multiply
   2,012.19x = 2,776.94 × 1,128.28
4. Step 4: Simplify right side
   2,012.19x = 3,133,165.86
5. Step 5: Solve for x
   x = 3,133,165.86/2,012.19
6. Step 6: Final answer
   x = 1,557.09