Finding the Fourth Proportional to 2,261.30, 3,121.83 and 1,553.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.30 : 3,121.83 = 1,553.55 : x
2. Step 2: Convert to fraction form
   2,261.30/3,121.83 = 1,553.55/x
3. Step 3: Cross multiply
   2,261.30x = 3,121.83 × 1,553.55
4. Step 4: Simplify right side
   2,261.30x = 4,849,919.00
5. Step 5: Solve for x
   x = 4,849,919.00/2,261.30
6. Step 6: Final answer
   x = 2,144.75