Finding the Fourth Proportional to 2,680.85, 3,696.77 and 2,120.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.85 : 3,696.77 = 2,120.42 : x
2. Step 2: Convert to fraction form
   2,680.85/3,696.77 = 2,120.42/x
3. Step 3: Cross multiply
   2,680.85x = 3,696.77 × 2,120.42
4. Step 4: Simplify right side
   2,680.85x = 7,838,719.59
5. Step 5: Solve for x
   x = 7,838,719.59/2,680.85
6. Step 6: Final answer
   x = 2,923.97