Finding the Fourth Proportional to 3,680.64, 5,520.56 and 1,083.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.64 : 5,520.56 = 1,083.78 : x
2. Step 2: Convert to fraction form
   3,680.64/5,520.56 = 1,083.78/x
3. Step 3: Cross multiply
   3,680.64x = 5,520.56 × 1,083.78
4. Step 4: Simplify right side
   3,680.64x = 5,983,067.10
5. Step 5: Solve for x
   x = 5,983,067.10/3,680.64
6. Step 6: Final answer
   x = 1,625.55