Finding the Fourth Proportional to 16,291.72, 22,478.88 and 9,215.56

Step by Step Solution

1. Step 1: Write the proportion equation
   16,291.72 : 22,478.88 = 9,215.56 : x
2. Step 2: Convert to fraction form
   16,291.72/22,478.88 = 9,215.56/x
3. Step 3: Cross multiply
   16,291.72x = 22,478.88 × 9,215.56
4. Step 4: Simplify right side
   16,291.72x = 207,155,467.37
5. Step 5: Solve for x
   x = 207,155,467.37/16,291.72
6. Step 6: Final answer
   x = 12,715.38