Finding the Fourth Proportional to 2,140.99, 2,954.56 and 1,209.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.99 : 2,954.56 = 1,209.49 : x
2. Step 2: Convert to fraction form
   2,140.99/2,954.56 = 1,209.49/x
3. Step 3: Cross multiply
   2,140.99x = 2,954.56 × 1,209.49
4. Step 4: Simplify right side
   2,140.99x = 3,573,510.77
5. Step 5: Solve for x
   x = 3,573,510.77/2,140.99
6. Step 6: Final answer
   x = 1,669.09