Finding the Fourth Proportional to 20,940, 28,901.46 and 12,445.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,940 : 28,901.46 = 12,445.34 : x
2. Step 2: Convert to fraction form
   20,940/28,901.46 = 12,445.34/x
3. Step 3: Cross multiply
   20,940x = 28,901.46 × 12,445.34
4. Step 4: Simplify right side
   20,940x = 359,688,351.69
5. Step 5: Solve for x
   x = 359,688,351.69/20,940
6. Step 6: Final answer
   x = 17,177.09