Finding the Fourth Proportional to 6,823.94, 9,414.59 and 3,990.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,823.94 : 9,414.59 = 3,990.30 : x
2. Step 2: Convert to fraction form
   6,823.94/9,414.59 = 3,990.30/x
3. Step 3: Cross multiply
   6,823.94x = 9,414.59 × 3,990.30
4. Step 4: Simplify right side
   6,823.94x = 37,567,018.53
5. Step 5: Solve for x
   x = 37,567,018.53/6,823.94
6. Step 6: Final answer
   x = 5,505.18