Finding the Fourth Proportional to 3,680.72, 5,079.56 and 2,109.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.72 : 5,079.56 = 2,109.04 : x
2. Step 2: Convert to fraction form
   3,680.72/5,079.56 = 2,109.04/x
3. Step 3: Cross multiply
   3,680.72x = 5,079.56 × 2,109.04
4. Step 4: Simplify right side
   3,680.72x = 10,712,995.22
5. Step 5: Solve for x
   x = 10,712,995.22/3,680.72
6. Step 6: Final answer
   x = 2,910.57