Finding the Fourth Proportional to 3,969.88, 5,478.54 and 2,201.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.88 : 5,478.54 = 2,201.56 : x
2. Step 2: Convert to fraction form
   3,969.88/5,478.54 = 2,201.56/x
3. Step 3: Cross multiply
   3,969.88x = 5,478.54 × 2,201.56
4. Step 4: Simplify right side
   3,969.88x = 12,061,334.52
5. Step 5: Solve for x
   x = 12,061,334.52/3,969.88
6. Step 6: Final answer
   x = 3,038.21