Finding the Fourth Proportional to 12,443.09, 17,193.31 and 9,945.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.09 : 17,193.31 = 9,945.79 : x
2. Step 2: Convert to fraction form
   12,443.09/17,193.31 = 9,945.79/x
3. Step 3: Cross multiply
   12,443.09x = 17,193.31 × 9,945.79
4. Step 4: Simplify right side
   12,443.09x = 171,001,047.29
5. Step 5: Solve for x
   x = 171,001,047.29/12,443.09
6. Step 6: Final answer
   x = 13,742.65