Finding the Fourth Proportional to 3,969.99, 5,478.50 and 2,201.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.99 : 5,478.50 = 2,201.56 : x
2. Step 2: Convert to fraction form
   3,969.99/5,478.50 = 2,201.56/x
3. Step 3: Cross multiply
   3,969.99x = 5,478.50 × 2,201.56
4. Step 4: Simplify right side
   3,969.99x = 12,061,238.27
5. Step 5: Solve for x
   x = 12,061,238.27/3,969.99
6. Step 6: Final answer
   x = 3,038.10