Finding the Fourth Proportional to 3,969.60, 5,403.06 and 3,969.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.60 : 5,403.06 = 3,969.60 : x
2. Step 2: Convert to fraction form
   3,969.60/5,403.06 = 3,969.60/x
3. Step 3: Cross multiply
   3,969.60x = 5,403.06 × 3,969.60
4. Step 4: Simplify right side
   3,969.60x = 21,447,986.98
5. Step 5: Solve for x
   x = 21,447,986.98/3,969.60
6. Step 6: Final answer
   x = 5,403.06