Finding the Fourth Proportional to 2,144.90, 2,959.94 and 1,213.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.90 : 2,959.94 = 1,213.40 : x
2. Step 2: Convert to fraction form
   2,144.90/2,959.94 = 1,213.40/x
3. Step 3: Cross multiply
   2,144.90x = 2,959.94 × 1,213.40
4. Step 4: Simplify right side
   2,144.90x = 3,591,591.20
5. Step 5: Solve for x
   x = 3,591,591.20/2,144.90
6. Step 6: Final answer
   x = 1,674.48