Finding the Fourth Proportional to 21,540.68, 29,725.88 and 12,109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.68 : 29,725.88 = 12,109.25 : x
2. Step 2: Convert to fraction form
   21,540.68/29,725.88 = 12,109.25/x
3. Step 3: Cross multiply
   21,540.68x = 29,725.88 × 12,109.25
4. Step 4: Simplify right side
   21,540.68x = 359,958,112.39
5. Step 5: Solve for x
   x = 359,958,112.39/21,540.68
6. Step 6: Final answer
   x = 16,710.62