Finding the Fourth Proportional to 2,143.89, 2,958.53 and 1,212.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.89 : 2,958.53 = 1,212.39 : x
2. Step 2: Convert to fraction form
   2,143.89/2,958.53 = 1,212.39/x
3. Step 3: Cross multiply
   2,143.89x = 2,958.53 × 1,212.39
4. Step 4: Simplify right side
   2,143.89x = 3,586,892.19
5. Step 5: Solve for x
   x = 3,586,892.19/2,143.89
6. Step 6: Final answer
   x = 1,673.08