Finding the Fourth Proportional to 2,078.30, 3,120.15 and 1,667.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.30 : 3,120.15 = 1,667.90 : x
2. Step 2: Convert to fraction form
   2,078.30/3,120.15 = 1,667.90/x
3. Step 3: Cross multiply
   2,078.30x = 3,120.15 × 1,667.90
4. Step 4: Simplify right side
   2,078.30x = 5,204,098.19
5. Step 5: Solve for x
   x = 5,204,098.19/2,078.30
6. Step 6: Final answer
   x = 2,504.02