Finding the Fourth Proportional to 8,526.57, 12,789.79 and 3,260.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,526.57 : 12,789.79 = 3,260.35 : x
2. Step 2: Convert to fraction form
   8,526.57/12,789.79 = 3,260.35/x
3. Step 3: Cross multiply
   8,526.57x = 12,789.79 × 3,260.35
4. Step 4: Simplify right side
   8,526.57x = 41,699,191.83
5. Step 5: Solve for x
   x = 41,699,191.83/8,526.57
6. Step 6: Final answer
   x = 4,890.50