Finding the Fourth Proportional to 10,453.15, 14,387.79 and 9,456.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,453.15 : 14,387.79 = 9,456.31 : x
2. Step 2: Convert to fraction form
   10,453.15/14,387.79 = 9,456.31/x
3. Step 3: Cross multiply
   10,453.15x = 14,387.79 × 9,456.31
4. Step 4: Simplify right side
   10,453.15x = 136,055,402.45
5. Step 5: Solve for x
   x = 136,055,402.45/10,453.15
6. Step 6: Final answer
   x = 13,015.73