Finding the Fourth Proportional to 20,766.15, 28,656.39 and 12,271

Step by Step Solution

1. Step 1: Write the proportion equation
   20,766.15 : 28,656.39 = 12,271 : x
2. Step 2: Convert to fraction form
   20,766.15/28,656.39 = 12,271/x
3. Step 3: Cross multiply
   20,766.15x = 28,656.39 × 12,271
4. Step 4: Simplify right side
   20,766.15x = 351,642,561.69
5. Step 5: Solve for x
   x = 351,642,561.69/20,766.15
6. Step 6: Final answer
   x = 16,933.45