Finding the Fourth Proportional to 2,013.10, 2,777.82 and 1,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.10 : 2,777.82 = 1,128.72 : x
2. Step 2: Convert to fraction form
   2,013.10/2,777.82 = 1,128.72/x
3. Step 3: Cross multiply
   2,013.10x = 2,777.82 × 1,128.72
4. Step 4: Simplify right side
   2,013.10x = 3,135,380.99
5. Step 5: Solve for x
   x = 3,135,380.99/2,013.10
6. Step 6: Final answer
   x = 1,557.49