Finding the Fourth Proportional to 3,976.54, 5,485.35 and 3,505.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,976.54 : 5,485.35 = 3,505.57 : x
2. Step 2: Convert to fraction form
   3,976.54/5,485.35 = 3,505.57/x
3. Step 3: Cross multiply
   3,976.54x = 5,485.35 × 3,505.57
4. Step 4: Simplify right side
   3,976.54x = 19,229,278.40
5. Step 5: Solve for x
   x = 19,229,278.40/3,976.54
6. Step 6: Final answer
   x = 4,835.68