Finding the Fourth Proportional to 20,091.24, 30,139.29 and 8,404.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,091.24 : 30,139.29 = 8,404.56 : x
2. Step 2: Convert to fraction form
   20,091.24/30,139.29 = 8,404.56/x
3. Step 3: Cross multiply
   20,091.24x = 30,139.29 × 8,404.56
4. Step 4: Simplify right side
   20,091.24x = 253,307,471.16
5. Step 5: Solve for x
   x = 253,307,471.16/20,091.24
6. Step 6: Final answer
   x = 12,607.86