Finding the Fourth Proportional to 2,609.20, 3,600.30 and 1,561

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.20 : 3,600.30 = 1,561 : x
2. Step 2: Convert to fraction form
   2,609.20/3,600.30 = 1,561/x
3. Step 3: Cross multiply
   2,609.20x = 3,600.30 × 1,561
4. Step 4: Simplify right side
   2,609.20x = 5,620,068.30
5. Step 5: Solve for x
   x = 5,620,068.30/2,609.20
6. Step 6: Final answer
   x = 2,153.94