Finding the Fourth Proportional to 20,793.41, 31,144.91 and 12,897.86

Step by Step Solution

1. Step 1: Write the proportion equation
   20,793.41 : 31,144.91 = 12,897.86 : x
2. Step 2: Convert to fraction form
   20,793.41/31,144.91 = 12,897.86/x
3. Step 3: Cross multiply
   20,793.41x = 31,144.91 × 12,897.86
4. Step 4: Simplify right side
   20,793.41x = 401,702,688.89
5. Step 5: Solve for x
   x = 401,702,688.89/20,793.41
6. Step 6: Final answer
   x = 19,318.75