Finding the Fourth Proportional to 2,561.63, 3,535.07 and 1,553.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.63 : 3,535.07 = 1,553.31 : x
2. Step 2: Convert to fraction form
   2,561.63/3,535.07 = 1,553.31/x
3. Step 3: Cross multiply
   2,561.63x = 3,535.07 × 1,553.31
4. Step 4: Simplify right side
   2,561.63x = 5,491,051.82
5. Step 5: Solve for x
   x = 5,491,051.82/2,561.63
6. Step 6: Final answer
   x = 2,143.58