Finding the Fourth Proportional to 12,378.57, 18,496.43 and 9,356.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,378.57 : 18,496.43 = 9,356.73 : x
2. Step 2: Convert to fraction form
   12,378.57/18,496.43 = 9,356.73/x
3. Step 3: Cross multiply
   12,378.57x = 18,496.43 × 9,356.73
4. Step 4: Simplify right side
   12,378.57x = 173,066,054.69
5. Step 5: Solve for x
   x = 173,066,054.69/12,378.57
6. Step 6: Final answer
   x = 13,981.10