Finding the Fourth Proportional to 21,858.24, 30,164.52 and 12,426.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,858.24 : 30,164.52 = 12,426.80 : x
2. Step 2: Convert to fraction form
   21,858.24/30,164.52 = 12,426.80/x
3. Step 3: Cross multiply
   21,858.24x = 30,164.52 × 12,426.80
4. Step 4: Simplify right side
   21,858.24x = 374,848,457.14
5. Step 5: Solve for x
   x = 374,848,457.14/21,858.24
6. Step 6: Final answer
   x = 17,149.07