Finding the Fourth Proportional to 16,235.72, 22,401.78 and 9,521.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,235.72 : 22,401.78 = 9,521.72 : x
2. Step 2: Convert to fraction form
   16,235.72/22,401.78 = 9,521.72/x
3. Step 3: Cross multiply
   16,235.72x = 22,401.78 × 9,521.72
4. Step 4: Simplify right side
   16,235.72x = 213,303,476.66
5. Step 5: Solve for x
   x = 213,303,476.66/16,235.72
6. Step 6: Final answer
   x = 13,137.91