Finding the Fourth Proportional to 6,936.78, 10,404.15 and 2,553.21

Step by Step Solution

1. Step 1: Write the proportion equation
   6,936.78 : 10,404.15 = 2,553.21 : x
2. Step 2: Convert to fraction form
   6,936.78/10,404.15 = 2,553.21/x
3. Step 3: Cross multiply
   6,936.78x = 10,404.15 × 2,553.21
4. Step 4: Simplify right side
   6,936.78x = 26,563,979.82
5. Step 5: Solve for x
   x = 26,563,979.82/6,936.78
6. Step 6: Final answer
   x = 3,829.44