Finding the Fourth Proportional to 2,012.57, 2,777.36 and 1,128.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.57 : 2,777.36 = 1,128.41 : x
2. Step 2: Convert to fraction form
   2,012.57/2,777.36 = 1,128.41/x
3. Step 3: Cross multiply
   2,012.57x = 2,777.36 × 1,128.41
4. Step 4: Simplify right side
   2,012.57x = 3,134,000.80
5. Step 5: Solve for x
   x = 3,134,000.80/2,012.57
6. Step 6: Final answer
   x = 1,557.21