Finding the Fourth Proportional to 2,609.89, 3,602.78 and 1,561.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.89 : 3,602.78 = 1,561.75 : x
2. Step 2: Convert to fraction form
   2,609.89/3,602.78 = 1,561.75/x
3. Step 3: Cross multiply
   2,609.89x = 3,602.78 × 1,561.75
4. Step 4: Simplify right side
   2,609.89x = 5,626,641.67
5. Step 5: Solve for x
   x = 5,626,641.67/2,609.89
6. Step 6: Final answer
   x = 2,155.89