Finding the Fourth Proportional to 6,780.78, 9,357.89 and 3,796.80

Step by Step Solution

1. Step 1: Write the proportion equation
   6,780.78 : 9,357.89 = 3,796.80 : x
2. Step 2: Convert to fraction form
   6,780.78/9,357.89 = 3,796.80/x
3. Step 3: Cross multiply
   6,780.78x = 9,357.89 × 3,796.80
4. Step 4: Simplify right side
   6,780.78x = 35,530,011.15
5. Step 5: Solve for x
   x = 35,530,011.15/6,780.78
6. Step 6: Final answer
   x = 5,239.81