Finding the Fourth Proportional to 9,721.56, 13,420.10 and 7,563.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,721.56 : 13,420.10 = 7,563.22 : x
2. Step 2: Convert to fraction form
   9,721.56/13,420.10 = 7,563.22/x
3. Step 3: Cross multiply
   9,721.56x = 13,420.10 × 7,563.22
4. Step 4: Simplify right side
   9,721.56x = 101,499,168.72
5. Step 5: Solve for x
   x = 101,499,168.72/9,721.56
6. Step 6: Final answer
   x = 10,440.63