Finding the Fourth Proportional to 20,569.43, 28,385.25 and 12,185.93

Step by Step Solution

1. Step 1: Write the proportion equation
   20,569.43 : 28,385.25 = 12,185.93 : x
2. Step 2: Convert to fraction form
   20,569.43/28,385.25 = 12,185.93/x
3. Step 3: Cross multiply
   20,569.43x = 28,385.25 × 12,185.93
4. Step 4: Simplify right side
   20,569.43x = 345,900,694.80
5. Step 5: Solve for x
   x = 345,900,694.80/20,569.43
6. Step 6: Final answer
   x = 16,816.25