Finding the Fourth Proportional to 1,786.55, 2,673.69 and 1,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,786.55 : 2,673.69 = 1,128.12 : x
2. Step 2: Convert to fraction form
   1,786.55/2,673.69 = 1,128.12/x
3. Step 3: Cross multiply
   1,786.55x = 2,673.69 × 1,128.12
4. Step 4: Simplify right side
   1,786.55x = 3,016,243.16
5. Step 5: Solve for x
   x = 3,016,243.16/1,786.55
6. Step 6: Final answer
   x = 1,688.31