Finding the Fourth Proportional to 3,709.56, 5,119.76 and 2,116.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,709.56 : 5,119.76 = 2,116.20 : x
2. Step 2: Convert to fraction form
   3,709.56/5,119.76 = 2,116.20/x
3. Step 3: Cross multiply
   3,709.56x = 5,119.76 × 2,116.20
4. Step 4: Simplify right side
   3,709.56x = 10,834,425.53
5. Step 5: Solve for x
   x = 10,834,425.53/3,709.56
6. Step 6: Final answer
   x = 2,920.68