Finding the Fourth Proportional to 21,857.08, 30,165.33 and 12,427.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,857.08 : 30,165.33 = 12,427.06 : x
2. Step 2: Convert to fraction form
   21,857.08/30,165.33 = 12,427.06/x
3. Step 3: Cross multiply
   21,857.08x = 30,165.33 × 12,427.06
4. Step 4: Simplify right side
   21,857.08x = 374,866,365.83
5. Step 5: Solve for x
   x = 374,866,365.83/21,857.08
6. Step 6: Final answer
   x = 17,150.80