Finding the Fourth Proportional to 2,013.31, 2,778.18 and 1,128.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.31 : 2,778.18 = 1,128.94 : x
2. Step 2: Convert to fraction form
   2,013.31/2,778.18 = 1,128.94/x
3. Step 3: Cross multiply
   2,013.31x = 2,778.18 × 1,128.94
4. Step 4: Simplify right side
   2,013.31x = 3,136,391.58
5. Step 5: Solve for x
   x = 3,136,391.58/2,013.31
6. Step 6: Final answer
   x = 1,557.83