Finding the Fourth Proportional to 8,404.80, 12,609.54 and 2,561.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,404.80 : 12,609.54 = 2,561.40 : x
2. Step 2: Convert to fraction form
   8,404.80/12,609.54 = 2,561.40/x
3. Step 3: Cross multiply
   8,404.80x = 12,609.54 × 2,561.40
4. Step 4: Simplify right side
   8,404.80x = 32,298,075.76
5. Step 5: Solve for x
   x = 32,298,075.76/8,404.80
6. Step 6: Final answer
   x = 3,842.81