Finding the Fourth Proportional to 20,877, 28,810.35 and 12,493.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,877 : 28,810.35 = 12,493.50 : x
2. Step 2: Convert to fraction form
   20,877/28,810.35 = 12,493.50/x
3. Step 3: Cross multiply
   20,877x = 28,810.35 × 12,493.50
4. Step 4: Simplify right side
   20,877x = 359,942,107.73
5. Step 5: Solve for x
   x = 359,942,107.73/20,877
6. Step 6: Final answer
   x = 17,241.08