Finding the Fourth Proportional to 13,819.34, 20,737.89 and 13,768.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,819.34 : 20,737.89 = 13,768.31 : x
2. Step 2: Convert to fraction form
   13,819.34/20,737.89 = 13,768.31/x
3. Step 3: Cross multiply
   13,819.34x = 20,737.89 × 13,768.31
4. Step 4: Simplify right side
   13,819.34x = 285,525,750.11
5. Step 5: Solve for x
   x = 285,525,750.11/13,819.34
6. Step 6: Final answer
   x = 20,661.31