Finding the Fourth Proportional to 2,144.52, 2,959.60 and 1,213.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.52 : 2,959.60 = 1,213.20 : x
2. Step 2: Convert to fraction form
   2,144.52/2,959.60 = 1,213.20/x
3. Step 3: Cross multiply
   2,144.52x = 2,959.60 × 1,213.20
4. Step 4: Simplify right side
   2,144.52x = 3,590,586.72
5. Step 5: Solve for x
   x = 3,590,586.72/2,144.52
6. Step 6: Final answer
   x = 1,674.31