Finding the Fourth Proportional to 5,815.82, 8,720.42 and 3,969.17

Step by Step Solution

1. Step 1: Write the proportion equation
   5,815.82 : 8,720.42 = 3,969.17 : x
2. Step 2: Convert to fraction form
   5,815.82/8,720.42 = 3,969.17/x
3. Step 3: Cross multiply
   5,815.82x = 8,720.42 × 3,969.17
4. Step 4: Simplify right side
   5,815.82x = 34,612,846.29
5. Step 5: Solve for x
   x = 34,612,846.29/5,815.82
6. Step 6: Final answer
   x = 5,951.50