Finding the Fourth Proportional to 21,771.15, 30,046.96 and 12,819.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,771.15 : 30,046.96 = 12,819.48 : x
2. Step 2: Convert to fraction form
   21,771.15/30,046.96 = 12,819.48/x
3. Step 3: Cross multiply
   21,771.15x = 30,046.96 × 12,819.48
4. Step 4: Simplify right side
   21,771.15x = 385,186,434.83
5. Step 5: Solve for x
   x = 385,186,434.83/21,771.15
6. Step 6: Final answer
   x = 17,692.52