Finding the Fourth Proportional to 6,388.78, 8,816.56 and 3,556.22

Step by Step Solution

1. Step 1: Write the proportion equation
   6,388.78 : 8,816.56 = 3,556.22 : x
2. Step 2: Convert to fraction form
   6,388.78/8,816.56 = 3,556.22/x
3. Step 3: Cross multiply
   6,388.78x = 8,816.56 × 3,556.22
4. Step 4: Simplify right side
   6,388.78x = 31,353,627.00
5. Step 5: Solve for x
   x = 31,353,627.00/6,388.78
6. Step 6: Final answer
   x = 4,907.61