Finding the Fourth Proportional to 8,485.56, 12,726.72 and 3,290.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,485.56 : 12,726.72 = 3,290.76 : x
2. Step 2: Convert to fraction form
   8,485.56/12,726.72 = 3,290.76/x
3. Step 3: Cross multiply
   8,485.56x = 12,726.72 × 3,290.76
4. Step 4: Simplify right side
   8,485.56x = 41,880,581.11
5. Step 5: Solve for x
   x = 41,880,581.11/8,485.56
6. Step 6: Final answer
   x = 4,935.51