Finding the Fourth Proportional to 21,669.39, 29,902.10 and 12,109.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,669.39 : 29,902.10 = 12,109.23 : x
2. Step 2: Convert to fraction form
   21,669.39/29,902.10 = 12,109.23/x
3. Step 3: Cross multiply
   21,669.39x = 29,902.10 × 12,109.23
4. Step 4: Simplify right side
   21,669.39x = 362,091,345.84
5. Step 5: Solve for x
   x = 362,091,345.84/21,669.39
6. Step 6: Final answer
   x = 16,709.81