Finding the Fourth Proportional to 8,561.50, 12,844.42 and 2,405.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,561.50 : 12,844.42 = 2,405.50 : x
2. Step 2: Convert to fraction form
   8,561.50/12,844.42 = 2,405.50/x
3. Step 3: Cross multiply
   8,561.50x = 12,844.42 × 2,405.50
4. Step 4: Simplify right side
   8,561.50x = 30,897,252.31
5. Step 5: Solve for x
   x = 30,897,252.31/8,561.50
6. Step 6: Final answer
   x = 3,608.86