Finding the Fourth Proportional to 20,895.69, 31,354.31 and 13,880.55

Step by Step Solution

1. Step 1: Write the proportion equation
   20,895.69 : 31,354.31 = 13,880.55 : x
2. Step 2: Convert to fraction form
   20,895.69/31,354.31 = 13,880.55/x
3. Step 3: Cross multiply
   20,895.69x = 31,354.31 × 13,880.55
4. Step 4: Simplify right side
   20,895.69x = 435,215,067.67
5. Step 5: Solve for x
   x = 435,215,067.67/20,895.69
6. Step 6: Final answer
   x = 20,827.98