Finding the Fourth Proportional to 12,638.73, 17,431.56 and 8,162.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.73 : 17,431.56 = 8,162.94 : x
2. Step 2: Convert to fraction form
   12,638.73/17,431.56 = 8,162.94/x
3. Step 3: Cross multiply
   12,638.73x = 17,431.56 × 8,162.94
4. Step 4: Simplify right side
   12,638.73x = 142,292,778.39
5. Step 5: Solve for x
   x = 142,292,778.39/12,638.73
6. Step 6: Final answer
   x = 11,258.47