Finding the Fourth Proportional to 1,103.56, 1,653.69 and 691.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.56 : 1,653.69 = 691.45 : x
2. Step 2: Convert to fraction form
   1,103.56/1,653.69 = 691.45/x
3. Step 3: Cross multiply
   1,103.56x = 1,653.69 × 691.45
4. Step 4: Simplify right side
   1,103.56x = 1,143,443.95
5. Step 5: Solve for x
   x = 1,143,443.95/1,103.56
6. Step 6: Final answer
   x = 1,036.14