Finding the Fourth Proportional to 3,213.77, 4,821.42 and 1,105.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,213.77 : 4,821.42 = 1,105.37 : x
2. Step 2: Convert to fraction form
   3,213.77/4,821.42 = 1,105.37/x
3. Step 3: Cross multiply
   3,213.77x = 4,821.42 × 1,105.37
4. Step 4: Simplify right side
   3,213.77x = 5,329,428.92
5. Step 5: Solve for x
   x = 5,329,428.92/3,213.77
6. Step 6: Final answer
   x = 1,658.31