Finding the Fourth Proportional to 6,405.78, 8,839.83 and 3,573.11

Step by Step Solution

1. Step 1: Write the proportion equation
   6,405.78 : 8,839.83 = 3,573.11 : x
2. Step 2: Convert to fraction form
   6,405.78/8,839.83 = 3,573.11/x
3. Step 3: Cross multiply
   6,405.78x = 8,839.83 × 3,573.11
4. Step 4: Simplify right side
   6,405.78x = 31,585,720.47
5. Step 5: Solve for x
   x = 31,585,720.47/6,405.78
6. Step 6: Final answer
   x = 4,930.81