Finding the Fourth Proportional to 2,144.07, 2,958.12 and 1,212.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.07 : 2,958.12 = 1,212.57 : x
2. Step 2: Convert to fraction form
   2,144.07/2,958.12 = 1,212.57/x
3. Step 3: Cross multiply
   2,144.07x = 2,958.12 × 1,212.57
4. Step 4: Simplify right side
   2,144.07x = 3,586,927.57
5. Step 5: Solve for x
   x = 3,586,927.57/2,144.07
6. Step 6: Final answer
   x = 1,672.95