Finding the Fourth Proportional to 21,999.24, 33,005.34 and 8,145

Step by Step Solution

1. Step 1: Write the proportion equation
   21,999.24 : 33,005.34 = 8,145 : x
2. Step 2: Convert to fraction form
   21,999.24/33,005.34 = 8,145/x
3. Step 3: Cross multiply
   21,999.24x = 33,005.34 × 8,145
4. Step 4: Simplify right side
   21,999.24x = 268,828,494.30
5. Step 5: Solve for x
   x = 268,828,494.30/21,999.24
6. Step 6: Final answer
   x = 12,219.90