Finding the Fourth Proportional to 21,164.37, 29,208.20 and 12,212.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,164.37 : 29,208.20 = 12,212.25 : x
2. Step 2: Convert to fraction form
   21,164.37/29,208.20 = 12,212.25/x
3. Step 3: Cross multiply
   21,164.37x = 29,208.20 × 12,212.25
4. Step 4: Simplify right side
   21,164.37x = 356,697,779.39
5. Step 5: Solve for x
   x = 356,697,779.39/21,164.37
6. Step 6: Final answer
   x = 16,853.69