Finding the Fourth Proportional to 3,680.85, 5,079.71 and 2,109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.85 : 5,079.71 = 2,109.25 : x
2. Step 2: Convert to fraction form
   3,680.85/5,079.71 = 2,109.25/x
3. Step 3: Cross multiply
   3,680.85x = 5,079.71 × 2,109.25
4. Step 4: Simplify right side
   3,680.85x = 10,714,349.50
5. Step 5: Solve for x
   x = 10,714,349.50/3,680.85
6. Step 6: Final answer
   x = 2,910.84