Finding the Fourth Proportional to 20,972.53, 31,469.79 and 8,493.88

Step by Step Solution

1. Step 1: Write the proportion equation
   20,972.53 : 31,469.79 = 8,493.88 : x
2. Step 2: Convert to fraction form
   20,972.53/31,469.79 = 8,493.88/x
3. Step 3: Cross multiply
   20,972.53x = 31,469.79 × 8,493.88
4. Step 4: Simplify right side
   20,972.53x = 267,300,619.89
5. Step 5: Solve for x
   x = 267,300,619.89/20,972.53
6. Step 6: Final answer
   x = 12,745.27