Finding the Fourth Proportional to 6,983.31, 9,636.69 and 3,999.42

Step by Step Solution

1. Step 1: Write the proportion equation
   6,983.31 : 9,636.69 = 3,999.42 : x
2. Step 2: Convert to fraction form
   6,983.31/9,636.69 = 3,999.42/x
3. Step 3: Cross multiply
   6,983.31x = 9,636.69 × 3,999.42
4. Step 4: Simplify right side
   6,983.31x = 38,541,170.72
5. Step 5: Solve for x
   x = 38,541,170.72/6,983.31
6. Step 6: Final answer
   x = 5,519.04