Finding the Fourth Proportional to 10,386.24, 15,559.20 and 9,222.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,386.24 : 15,559.20 = 9,222.72 : x
2. Step 2: Convert to fraction form
   10,386.24/15,559.20 = 9,222.72/x
3. Step 3: Cross multiply
   10,386.24x = 15,559.20 × 9,222.72
4. Step 4: Simplify right side
   10,386.24x = 143,498,145.02
5. Step 5: Solve for x
   x = 143,498,145.02/10,386.24
6. Step 6: Final answer
   x = 13,816.18