Finding the Fourth Proportional to 3,969.86, 5,478.63 and 2,201.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.86 : 5,478.63 = 2,201.54 : x
2. Step 2: Convert to fraction form
   3,969.86/5,478.63 = 2,201.54/x
3. Step 3: Cross multiply
   3,969.86x = 5,478.63 × 2,201.54
4. Step 4: Simplify right side
   3,969.86x = 12,061,423.09
5. Step 5: Solve for x
   x = 12,061,423.09/3,969.86
6. Step 6: Final answer
   x = 3,038.25