Finding the Fourth Proportional to 3,969.98, 5,478.32 and 2,201.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.98 : 5,478.32 = 2,201.55 : x
2. Step 2: Convert to fraction form
   3,969.98/5,478.32 = 2,201.55/x
3. Step 3: Cross multiply
   3,969.98x = 5,478.32 × 2,201.55
4. Step 4: Simplify right side
   3,969.98x = 12,060,784.39
5. Step 5: Solve for x
   x = 12,060,784.39/3,969.98
6. Step 6: Final answer
   x = 3,038.00