Finding the Fourth Proportional to 3,708.36, 5,105.88 and 3,147.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,708.36 : 5,105.88 = 3,147.72 : x
2. Step 2: Convert to fraction form
   3,708.36/5,105.88 = 3,147.72/x
3. Step 3: Cross multiply
   3,708.36x = 5,105.88 × 3,147.72
4. Step 4: Simplify right side
   3,708.36x = 16,071,880.59
5. Step 5: Solve for x
   x = 16,071,880.59/3,708.36
6. Step 6: Final answer
   x = 4,333.96