Finding the Fourth Proportional to 16,401.74, 22,645.29 and 12,618.23

Step by Step Solution

1. Step 1: Write the proportion equation
   16,401.74 : 22,645.29 = 12,618.23 : x
2. Step 2: Convert to fraction form
   16,401.74/22,645.29 = 12,618.23/x
3. Step 3: Cross multiply
   16,401.74x = 22,645.29 × 12,618.23
4. Step 4: Simplify right side
   16,401.74x = 285,743,399.21
5. Step 5: Solve for x
   x = 285,743,399.21/16,401.74
6. Step 6: Final answer
   x = 17,421.53