Finding the Fourth Proportional to 3,196.80, 4,406.40 and 3,196.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,196.80 : 4,406.40 = 3,196.80 : x
2. Step 2: Convert to fraction form
   3,196.80/4,406.40 = 3,196.80/x
3. Step 3: Cross multiply
   3,196.80x = 4,406.40 × 3,196.80
4. Step 4: Simplify right side
   3,196.80x = 14,086,379.52
5. Step 5: Solve for x
   x = 14,086,379.52/3,196.80
6. Step 6: Final answer
   x = 4,406.40