Finding the Fourth Proportional to 2,013.72, 2,778.88 and 1,129.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.72 : 2,778.88 = 1,129.56 : x
2. Step 2: Convert to fraction form
   2,013.72/2,778.88 = 1,129.56/x
3. Step 3: Cross multiply
   2,013.72x = 2,778.88 × 1,129.56
4. Step 4: Simplify right side
   2,013.72x = 3,138,911.69
5. Step 5: Solve for x
   x = 3,138,911.69/2,013.72
6. Step 6: Final answer
   x = 1,558.76