Finding the Fourth Proportional to 3,960.60, 5,934.60 and 2,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.60 : 5,934.60 = 2,109.30 : x
2. Step 2: Convert to fraction form
   3,960.60/5,934.60 = 2,109.30/x
3. Step 3: Cross multiply
   3,960.60x = 5,934.60 × 2,109.30
4. Step 4: Simplify right side
   3,960.60x = 12,517,851.78
5. Step 5: Solve for x
   x = 12,517,851.78/3,960.60
6. Step 6: Final answer
   x = 3,160.59