Finding the Fourth Proportional to 21,878.51, 30,196.85 and 14,231.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,878.51 : 30,196.85 = 14,231.33 : x
2. Step 2: Convert to fraction form
   21,878.51/30,196.85 = 14,231.33/x
3. Step 3: Cross multiply
   21,878.51x = 30,196.85 × 14,231.33
4. Step 4: Simplify right side
   21,878.51x = 429,741,435.85
5. Step 5: Solve for x
   x = 429,741,435.85/21,878.51
6. Step 6: Final answer
   x = 19,642.18