Finding the Fourth Proportional to 21,227.07, 31,796.85 and 12,435.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,227.07 : 31,796.85 = 12,435.33 : x
2. Step 2: Convert to fraction form
   21,227.07/31,796.85 = 12,435.33/x
3. Step 3: Cross multiply
   21,227.07x = 31,796.85 × 12,435.33
4. Step 4: Simplify right side
   21,227.07x = 395,404,322.71
5. Step 5: Solve for x
   x = 395,404,322.71/21,227.07
6. Step 6: Final answer
   x = 18,627.36