Finding the Fourth Proportional to 20,875.41, 31,305.34 and 8,391.23

Step by Step Solution

1. Step 1: Write the proportion equation
   20,875.41 : 31,305.34 = 8,391.23 : x
2. Step 2: Convert to fraction form
   20,875.41/31,305.34 = 8,391.23/x
3. Step 3: Cross multiply
   20,875.41x = 31,305.34 × 8,391.23
4. Step 4: Simplify right side
   20,875.41x = 262,690,258.55
5. Step 5: Solve for x
   x = 262,690,258.55/20,875.41
6. Step 6: Final answer
   x = 12,583.72