Finding the Fourth Proportional to 20,621.94, 28,456.52 and 12,124.32

Step by Step Solution

1. Step 1: Write the proportion equation
   20,621.94 : 28,456.52 = 12,124.32 : x
2. Step 2: Convert to fraction form
   20,621.94/28,456.52 = 12,124.32/x
3. Step 3: Cross multiply
   20,621.94x = 28,456.52 × 12,124.32
4. Step 4: Simplify right side
   20,621.94x = 345,015,954.57
5. Step 5: Solve for x
   x = 345,015,954.57/20,621.94
6. Step 6: Final answer
   x = 16,730.53