Finding the Fourth Proportional to 8,555.49, 12,830.76 and 3,290.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,555.49 : 12,830.76 = 3,290.15 : x
2. Step 2: Convert to fraction form
   8,555.49/12,830.76 = 3,290.15/x
3. Step 3: Cross multiply
   8,555.49x = 12,830.76 × 3,290.15
4. Step 4: Simplify right side
   8,555.49x = 42,215,157.09
5. Step 5: Solve for x
   x = 42,215,157.09/8,555.49
6. Step 6: Final answer
   x = 4,934.28