Finding the Fourth Proportional to 3,969.15, 5,477.46 and 2,200.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.15 : 5,477.46 = 2,200.78 : x
2. Step 2: Convert to fraction form
   3,969.15/5,477.46 = 2,200.78/x
3. Step 3: Cross multiply
   3,969.15x = 5,477.46 × 2,200.78
4. Step 4: Simplify right side
   3,969.15x = 12,054,684.42
5. Step 5: Solve for x
   x = 12,054,684.42/3,969.15
6. Step 6: Final answer
   x = 3,037.09