Finding the Fourth Proportional to 6,404.78, 8,839.18 and 3,887.54

Step by Step Solution

1. Step 1: Write the proportion equation
   6,404.78 : 8,839.18 = 3,887.54 : x
2. Step 2: Convert to fraction form
   6,404.78/8,839.18 = 3,887.54/x
3. Step 3: Cross multiply
   6,404.78x = 8,839.18 × 3,887.54
4. Step 4: Simplify right side
   6,404.78x = 34,362,621.62
5. Step 5: Solve for x
   x = 34,362,621.62/6,404.78
6. Step 6: Final answer
   x = 5,365.15