Finding the Fourth Proportional to 3,945.68, 5,440.20 and 3,196.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.68 : 5,440.20 = 3,196.88 : x
2. Step 2: Convert to fraction form
   3,945.68/5,440.20 = 3,196.88/x
3. Step 3: Cross multiply
   3,945.68x = 5,440.20 × 3,196.88
4. Step 4: Simplify right side
   3,945.68x = 17,391,666.58
5. Step 5: Solve for x
   x = 17,391,666.58/3,945.68
6. Step 6: Final answer
   x = 4,407.77