Finding the Fourth Proportional to 3,680.21, 5,078.55 and 2,108.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.21 : 5,078.55 = 2,108.00 : x
2. Step 2: Convert to fraction form
   3,680.21/5,078.55 = 2,108.00/x
3. Step 3: Cross multiply
   3,680.21x = 5,078.55 × 2,108.00
4. Step 4: Simplify right side
   3,680.21x = 10,705,558.01
5. Step 5: Solve for x
   x = 10,705,558.01/3,680.21
6. Step 6: Final answer
   x = 2,908.96