Finding the Fourth Proportional to 21,962.29, 30,308.47 and 12,405.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,962.29 : 30,308.47 = 12,405.25 : x
2. Step 2: Convert to fraction form
   21,962.29/30,308.47 = 12,405.25/x
3. Step 3: Cross multiply
   21,962.29x = 30,308.47 × 12,405.25
4. Step 4: Simplify right side
   21,962.29x = 375,984,040.68
5. Step 5: Solve for x
   x = 375,984,040.68/21,962.29
6. Step 6: Final answer
   x = 17,119.53