Finding the Fourth Proportional to 12,157.72, 18,205.02 and 10,413.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,157.72 : 18,205.02 = 10,413.91 : x
2. Step 2: Convert to fraction form
   12,157.72/18,205.02 = 10,413.91/x
3. Step 3: Cross multiply
   12,157.72x = 18,205.02 × 10,413.91
4. Step 4: Simplify right side
   12,157.72x = 189,585,439.83
5. Step 5: Solve for x
   x = 189,585,439.83/12,157.72
6. Step 6: Final answer
   x = 15,593.83