Finding the Fourth Proportional to 3,603.84, 5,406.05 and 1,105.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,603.84 : 5,406.05 = 1,105.57 : x
2. Step 2: Convert to fraction form
   3,603.84/5,406.05 = 1,105.57/x
3. Step 3: Cross multiply
   3,603.84x = 5,406.05 × 1,105.57
4. Step 4: Simplify right side
   3,603.84x = 5,976,766.70
5. Step 5: Solve for x
   x = 5,976,766.70/3,603.84
6. Step 6: Final answer
   x = 1,658.44