Finding the Fourth Proportional to 20,945.16, 28,908.72 and 13,283.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,945.16 : 28,908.72 = 13,283.46 : x
2. Step 2: Convert to fraction form
   20,945.16/28,908.72 = 13,283.46/x
3. Step 3: Cross multiply
   20,945.16x = 28,908.72 × 13,283.46
4. Step 4: Simplify right side
   20,945.16x = 384,007,825.77
5. Step 5: Solve for x
   x = 384,007,825.77/20,945.16
6. Step 6: Final answer
   x = 18,333.96