Finding the Fourth Proportional to 2,561.67, 3,535.11 and 1,513.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.67 : 3,535.11 = 1,513.80 : x
2. Step 2: Convert to fraction form
   2,561.67/3,535.11 = 1,513.80/x
3. Step 3: Cross multiply
   2,561.67x = 3,535.11 × 1,513.80
4. Step 4: Simplify right side
   2,561.67x = 5,351,449.52
5. Step 5: Solve for x
   x = 5,351,449.52/2,561.67
6. Step 6: Final answer
   x = 2,089.05