Finding the Fourth Proportional to 1,377.36, 1,903.49 and 1,128.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.36 : 1,903.49 = 1,128.29 : x
2. Step 2: Convert to fraction form
   1,377.36/1,903.49 = 1,128.29/x
3. Step 3: Cross multiply
   1,377.36x = 1,903.49 × 1,128.29
4. Step 4: Simplify right side
   1,377.36x = 2,147,673.57
5. Step 5: Solve for x
   x = 2,147,673.57/1,377.36
6. Step 6: Final answer
   x = 1,559.27