Finding the Fourth Proportional to 2,140.89, 2,954.40 and 1,209.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.89 : 2,954.40 = 1,209.39 : x
2. Step 2: Convert to fraction form
   2,140.89/2,954.40 = 1,209.39/x
3. Step 3: Cross multiply
   2,140.89x = 2,954.40 × 1,209.39
4. Step 4: Simplify right side
   2,140.89x = 3,573,021.82
5. Step 5: Solve for x
   x = 3,573,021.82/2,140.89
6. Step 6: Final answer
   x = 1,668.94