Finding the Fourth Proportional to 2,669.20, 3,685.55 and 2,078.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.20 : 3,685.55 = 2,078.71 : x
2. Step 2: Convert to fraction form
   2,669.20/3,685.55 = 2,078.71/x
3. Step 3: Cross multiply
   2,669.20x = 3,685.55 × 2,078.71
4. Step 4: Simplify right side
   2,669.20x = 7,661,202.46
5. Step 5: Solve for x
   x = 7,661,202.46/2,669.20
6. Step 6: Final answer
   x = 2,870.22