Finding the Fourth Proportional to 2,144.81, 2,959.84 and 1,213.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.81 : 2,959.84 = 1,213.31 : x
2. Step 2: Convert to fraction form
   2,144.81/2,959.84 = 1,213.31/x
3. Step 3: Cross multiply
   2,144.81x = 2,959.84 × 1,213.31
4. Step 4: Simplify right side
   2,144.81x = 3,591,212.39
5. Step 5: Solve for x
   x = 3,591,212.39/2,144.81
6. Step 6: Final answer
   x = 1,674.37