Finding the Fourth Proportional to 6,940.78, 10,415.78 and 3,243.29

Step by Step Solution

1. Step 1: Write the proportion equation
   6,940.78 : 10,415.78 = 3,243.29 : x
2. Step 2: Convert to fraction form
   6,940.78/10,415.78 = 3,243.29/x
3. Step 3: Cross multiply
   6,940.78x = 10,415.78 × 3,243.29
4. Step 4: Simplify right side
   6,940.78x = 33,781,378.90
5. Step 5: Solve for x
   x = 33,781,378.90/6,940.78
6. Step 6: Final answer
   x = 4,867.09