Finding the Fourth Proportional to 6,391.36, 8,819.43 and 3,558.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391.36 : 8,819.43 = 3,558.89 : x
2. Step 2: Convert to fraction form
   6,391.36/8,819.43 = 3,558.89/x
3. Step 3: Cross multiply
   6,391.36x = 8,819.43 × 3,558.89
4. Step 4: Simplify right side
   6,391.36x = 31,387,360.34
5. Step 5: Solve for x
   x = 31,387,360.34/6,391.36
6. Step 6: Final answer
   x = 4,910.91