Finding the Fourth Proportional to 15,653.24, 21,603.69 and 9,686.83

Step by Step Solution

1. Step 1: Write the proportion equation
   15,653.24 : 21,603.69 = 9,686.83 : x
2. Step 2: Convert to fraction form
   15,653.24/21,603.69 = 9,686.83/x
3. Step 3: Cross multiply
   15,653.24x = 21,603.69 × 9,686.83
4. Step 4: Simplify right side
   15,653.24x = 209,271,314.30
5. Step 5: Solve for x
   x = 209,271,314.30/15,653.24
6. Step 6: Final answer
   x = 13,369.20