Finding the Fourth Proportional to 2,411.81, 3,326.50 and 1,561.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.81 : 3,326.50 = 1,561.28 : x
2. Step 2: Convert to fraction form
   2,411.81/3,326.50 = 1,561.28/x
3. Step 3: Cross multiply
   2,411.81x = 3,326.50 × 1,561.28
4. Step 4: Simplify right side
   2,411.81x = 5,193,583.24
5. Step 5: Solve for x
   x = 5,193,583.24/2,411.81
6. Step 6: Final answer
   x = 2,153.40