Finding the Fourth Proportional to 8,141.72, 12,205.38 and 3,979.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,141.72 : 12,205.38 = 3,979.40 : x
2. Step 2: Convert to fraction form
   8,141.72/12,205.38 = 3,979.40/x
3. Step 3: Cross multiply
   8,141.72x = 12,205.38 × 3,979.40
4. Step 4: Simplify right side
   8,141.72x = 48,570,089.17
5. Step 5: Solve for x
   x = 48,570,089.17/8,141.72
6. Step 6: Final answer
   x = 5,965.58