Finding the Fourth Proportional to 2,609.72, 3,602.32 and 1,561.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.72 : 3,602.32 = 1,561.78 : x
2. Step 2: Convert to fraction form
   2,609.72/3,602.32 = 1,561.78/x
3. Step 3: Cross multiply
   2,609.72x = 3,602.32 × 1,561.78
4. Step 4: Simplify right side
   2,609.72x = 5,626,040.71
5. Step 5: Solve for x
   x = 5,626,040.71/2,609.72
6. Step 6: Final answer
   x = 2,155.80