Finding the Fourth Proportional to 2,012.20, 2,776.84 and 1,128.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.20 : 2,776.84 = 1,128.01 : x
2. Step 2: Convert to fraction form
   2,012.20/2,776.84 = 1,128.01/x
3. Step 3: Cross multiply
   2,012.20x = 2,776.84 × 1,128.01
4. Step 4: Simplify right side
   2,012.20x = 3,132,290.06
5. Step 5: Solve for x
   x = 3,132,290.06/2,012.20
6. Step 6: Final answer
   x = 1,556.65