Finding the Fourth Proportional to 20,766.30, 31,076.55 and 14,205.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,766.30 : 31,076.55 = 14,205.30 : x
2. Step 2: Convert to fraction form
   20,766.30/31,076.55 = 14,205.30/x
3. Step 3: Cross multiply
   20,766.30x = 31,076.55 × 14,205.30
4. Step 4: Simplify right side
   20,766.30x = 441,451,715.72
5. Step 5: Solve for x
   x = 441,451,715.72/20,766.30
6. Step 6: Final answer
   x = 21,258.08