Finding the Fourth Proportional to 2,013.18, 2,778.57 and 1,129.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.18 : 2,778.57 = 1,129.38 : x
2. Step 2: Convert to fraction form
   2,013.18/2,778.57 = 1,129.38/x
3. Step 3: Cross multiply
   2,013.18x = 2,778.57 × 1,129.38
4. Step 4: Simplify right side
   2,013.18x = 3,138,061.39
5. Step 5: Solve for x
   x = 3,138,061.39/2,013.18
6. Step 6: Final answer
   x = 1,558.76