Finding the Fourth Proportional to 21,814.15, 30,099.90 and 12,860.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,814.15 : 30,099.90 = 12,860.41 : x
2. Step 2: Convert to fraction form
   21,814.15/30,099.90 = 12,860.41/x
3. Step 3: Cross multiply
   21,814.15x = 30,099.90 × 12,860.41
4. Step 4: Simplify right side
   21,814.15x = 387,097,054.96
5. Step 5: Solve for x
   x = 387,097,054.96/21,814.15
6. Step 6: Final answer
   x = 17,745.23