Finding the Fourth Proportional to 3,947.81, 5,443.13 and 3,199.01

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.81 : 5,443.13 = 3,199.01 : x
2. Step 2: Convert to fraction form
   3,947.81/5,443.13 = 3,199.01/x
3. Step 3: Cross multiply
   3,947.81x = 5,443.13 × 3,199.01
4. Step 4: Simplify right side
   3,947.81x = 17,412,627.30
5. Step 5: Solve for x
   x = 17,412,627.30/3,947.81
6. Step 6: Final answer
   x = 4,410.71