Finding the Fourth Proportional to 2,012.58, 2,776.79 and 1,128.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.58 : 2,776.79 = 1,128.35 : x
2. Step 2: Convert to fraction form
   2,012.58/2,776.79 = 1,128.35/x
3. Step 3: Cross multiply
   2,012.58x = 2,776.79 × 1,128.35
4. Step 4: Simplify right side
   2,012.58x = 3,133,200.76
5. Step 5: Solve for x
   x = 3,133,200.76/2,012.58
6. Step 6: Final answer
   x = 1,556.81