Finding the Fourth Proportional to 3,680.86, 5,078.52 and 2,108.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.86 : 5,078.52 = 2,108.64 : x
2. Step 2: Convert to fraction form
   3,680.86/5,078.52 = 2,108.64/x
3. Step 3: Cross multiply
   3,680.86x = 5,078.52 × 2,108.64
4. Step 4: Simplify right side
   3,680.86x = 10,708,770.41
5. Step 5: Solve for x
   x = 10,708,770.41/3,680.86
6. Step 6: Final answer
   x = 2,909.31