Finding the Fourth Proportional to 21,878.52, 32,828.49 and 13,556.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,878.52 : 32,828.49 = 13,556.31 : x
2. Step 2: Convert to fraction form
   21,878.52/32,828.49 = 13,556.31/x
3. Step 3: Cross multiply
   21,878.52x = 32,828.49 × 13,556.31
4. Step 4: Simplify right side
   21,878.52x = 445,033,187.27
5. Step 5: Solve for x
   x = 445,033,187.27/21,878.52
6. Step 6: Final answer
   x = 20,341.10