Finding the Fourth Proportional to 7,147.37, 10,721.72 and 2,215.69

Step by Step Solution

1. Step 1: Write the proportion equation
   7,147.37 : 10,721.72 = 2,215.69 : x
2. Step 2: Convert to fraction form
   7,147.37/10,721.72 = 2,215.69/x
3. Step 3: Cross multiply
   7,147.37x = 10,721.72 × 2,215.69
4. Step 4: Simplify right side
   7,147.37x = 23,755,986.52
5. Step 5: Solve for x
   x = 23,755,986.52/7,147.37
6. Step 6: Final answer
   x = 3,323.74