Finding the Fourth Proportional to 2,012.98, 2,777.89 and 1,128.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.98 : 2,777.89 = 1,128.79 : x
2. Step 2: Convert to fraction form
   2,012.98/2,777.89 = 1,128.79/x
3. Step 3: Cross multiply
   2,012.98x = 2,777.89 × 1,128.79
4. Step 4: Simplify right side
   2,012.98x = 3,135,654.45
5. Step 5: Solve for x
   x = 3,135,654.45/2,012.98
6. Step 6: Final answer
   x = 1,557.72