Finding the Fourth Proportional to 12,413.28, 17,128.80 and 7,377.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,413.28 : 17,128.80 = 7,377.60 : x
2. Step 2: Convert to fraction form
   12,413.28/17,128.80 = 7,377.60/x
3. Step 3: Cross multiply
   12,413.28x = 17,128.80 × 7,377.60
4. Step 4: Simplify right side
   12,413.28x = 126,369,434.88
5. Step 5: Solve for x
   x = 126,369,434.88/12,413.28
6. Step 6: Final answer
   x = 10,180.18