Finding the Fourth Proportional to 20,767.27, 31,154.56 and 8,928.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,767.27 : 31,154.56 = 8,928.31 : x
2. Step 2: Convert to fraction form
   20,767.27/31,154.56 = 8,928.31/x
3. Step 3: Cross multiply
   20,767.27x = 31,154.56 × 8,928.31
4. Step 4: Simplify right side
   20,767.27x = 278,157,569.59
5. Step 5: Solve for x
   x = 278,157,569.59/20,767.27
6. Step 6: Final answer
   x = 13,394.04