Finding the Fourth Proportional to 2,144.16, 2,959.20 and 1,212.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.16 : 2,959.20 = 1,212.48 : x
2. Step 2: Convert to fraction form
   2,144.16/2,959.20 = 1,212.48/x
3. Step 3: Cross multiply
   2,144.16x = 2,959.20 × 1,212.48
4. Step 4: Simplify right side
   2,144.16x = 3,587,970.82
5. Step 5: Solve for x
   x = 3,587,970.82/2,144.16
6. Step 6: Final answer
   x = 1,673.37