Finding the Fourth Proportional to 7,128.72, 10,693.10 and 2,198.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.72 : 10,693.10 = 2,198.20 : x
2. Step 2: Convert to fraction form
   7,128.72/10,693.10 = 2,198.20/x
3. Step 3: Cross multiply
   7,128.72x = 10,693.10 × 2,198.20
4. Step 4: Simplify right side
   7,128.72x = 23,505,572.42
5. Step 5: Solve for x
   x = 23,505,572.42/7,128.72
6. Step 6: Final answer
   x = 3,297.31