Finding the Fourth Proportional to 6,388.16, 8,815.55 and 3,555.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,388.16 : 8,815.55 = 3,555.72 : x
2. Step 2: Convert to fraction form
   6,388.16/8,815.55 = 3,555.72/x
3. Step 3: Cross multiply
   6,388.16x = 8,815.55 × 3,555.72
4. Step 4: Simplify right side
   6,388.16x = 31,345,609.67
5. Step 5: Solve for x
   x = 31,345,609.67/6,388.16
6. Step 6: Final answer
   x = 4,906.83