Finding the Fourth Proportional to 14,383.72, 19,847.06 and 13,221.05

Step by Step Solution

1. Step 1: Write the proportion equation
   14,383.72 : 19,847.06 = 13,221.05 : x
2. Step 2: Convert to fraction form
   14,383.72/19,847.06 = 13,221.05/x
3. Step 3: Cross multiply
   14,383.72x = 19,847.06 × 13,221.05
4. Step 4: Simplify right side
   14,383.72x = 262,399,055.28
5. Step 5: Solve for x
   x = 262,399,055.28/14,383.72
6. Step 6: Final answer
   x = 18,242.78