Finding the Fourth Proportional to 18,405, 25,401.78 and 10,957.32

Step by Step Solution

1. Step 1: Write the proportion equation
   18,405 : 25,401.78 = 10,957.32 : x
2. Step 2: Convert to fraction form
   18,405/25,401.78 = 10,957.32/x
3. Step 3: Cross multiply
   18,405x = 25,401.78 × 10,957.32
4. Step 4: Simplify right side
   18,405x = 278,335,432.03
5. Step 5: Solve for x
   x = 278,335,432.03/18,405
6. Step 6: Final answer
   x = 15,122.82