Finding the Fourth Proportional to 2,012.95, 2,777.52 and 1,128.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.95 : 2,777.52 = 1,128.79 : x
2. Step 2: Convert to fraction form
   2,012.95/2,777.52 = 1,128.79/x
3. Step 3: Cross multiply
   2,012.95x = 2,777.52 × 1,128.79
4. Step 4: Simplify right side
   2,012.95x = 3,135,236.80
5. Step 5: Solve for x
   x = 3,135,236.80/2,012.95
6. Step 6: Final answer
   x = 1,557.53