Finding the Fourth Proportional to 2,013.69, 2,778.72 and 1,129.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.69 : 2,778.72 = 1,129.37 : x
2. Step 2: Convert to fraction form
   2,013.69/2,778.72 = 1,129.37/x
3. Step 3: Cross multiply
   2,013.69x = 2,778.72 × 1,129.37
4. Step 4: Simplify right side
   2,013.69x = 3,138,189.11
5. Step 5: Solve for x
   x = 3,138,189.11/2,013.69
6. Step 6: Final answer
   x = 1,558.43