Finding the Fourth Proportional to 2,012.60, 2,777.47 and 1,128.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.60 : 2,777.47 = 1,128.38 : x
2. Step 2: Convert to fraction form
   2,012.60/2,777.47 = 1,128.38/x
3. Step 3: Cross multiply
   2,012.60x = 2,777.47 × 1,128.38
4. Step 4: Simplify right side
   2,012.60x = 3,134,024.89
5. Step 5: Solve for x
   x = 3,134,024.89/2,012.60
6. Step 6: Final answer
   x = 1,557.20