Finding the Fourth Proportional to 1,128.68, 1,690.56 and 694.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.68 : 1,690.56 = 694.52 : x
2. Step 2: Convert to fraction form
   1,128.68/1,690.56 = 694.52/x
3. Step 3: Cross multiply
   1,128.68x = 1,690.56 × 694.52
4. Step 4: Simplify right side
   1,128.68x = 1,174,127.73
5. Step 5: Solve for x
   x = 1,174,127.73/1,128.68
6. Step 6: Final answer
   x = 1,040.27