Finding the Fourth Proportional to 2,013.28, 2,778.37 and 1,129.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.28 : 2,778.37 = 1,129.37 : x
2. Step 2: Convert to fraction form
   2,013.28/2,778.37 = 1,129.37/x
3. Step 3: Cross multiply
   2,013.28x = 2,778.37 × 1,129.37
4. Step 4: Simplify right side
   2,013.28x = 3,137,788.19
5. Step 5: Solve for x
   x = 3,137,788.19/2,013.28
6. Step 6: Final answer
   x = 1,558.55