Finding the Fourth Proportional to 2,013.60, 2,778.71 and 1,129.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.60 : 2,778.71 = 1,129.71 : x
2. Step 2: Convert to fraction form
   2,013.60/2,778.71 = 1,129.71/x
3. Step 3: Cross multiply
   2,013.60x = 2,778.71 × 1,129.71
4. Step 4: Simplify right side
   2,013.60x = 3,139,130.83
5. Step 5: Solve for x
   x = 3,139,130.83/2,013.60
6. Step 6: Final answer
   x = 1,558.96