Finding the Fourth Proportional to 2,012.96, 2,777.67 and 1,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.96 : 2,777.67 = 1,128.56 : x
2. Step 2: Convert to fraction form
   2,012.96/2,777.67 = 1,128.56/x
3. Step 3: Cross multiply
   2,012.96x = 2,777.67 × 1,128.56
4. Step 4: Simplify right side
   2,012.96x = 3,134,767.26
5. Step 5: Solve for x
   x = 3,134,767.26/2,012.96
6. Step 6: Final answer
   x = 1,557.29