Finding the Fourth Proportional to 2,555.30, 3,527.16 and 1,611.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.30 : 3,527.16 = 1,611.20 : x
2. Step 2: Convert to fraction form
   2,555.30/3,527.16 = 1,611.20/x
3. Step 3: Cross multiply
   2,555.30x = 3,527.16 × 1,611.20
4. Step 4: Simplify right side
   2,555.30x = 5,682,960.19
5. Step 5: Solve for x
   x = 5,682,960.19/2,555.30
6. Step 6: Final answer
   x = 2,223.99