Finding the Fourth Proportional to 7,139.20, 10,704.96 and 2,206.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139.20 : 10,704.96 = 2,206.72 : x
2. Step 2: Convert to fraction form
   7,139.20/10,704.96 = 2,206.72/x
3. Step 3: Cross multiply
   7,139.20x = 10,704.96 × 2,206.72
4. Step 4: Simplify right side
   7,139.20x = 23,622,849.33
5. Step 5: Solve for x
   x = 23,622,849.33/7,139.20
6. Step 6: Final answer
   x = 3,308.89