Finding the Fourth Proportional to 2,209.57, 3,049.47 and 1,278.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.57 : 3,049.47 = 1,278.07 : x
2. Step 2: Convert to fraction form
   2,209.57/3,049.47 = 1,278.07/x
3. Step 3: Cross multiply
   2,209.57x = 3,049.47 × 1,278.07
4. Step 4: Simplify right side
   2,209.57x = 3,897,436.12
5. Step 5: Solve for x
   x = 3,897,436.12/2,209.57
6. Step 6: Final answer
   x = 1,763.89