Finding the Fourth Proportional to 13,413.96, 18,510.42 and 7,445.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,413.96 : 18,510.42 = 7,445.28 : x
2. Step 2: Convert to fraction form
   13,413.96/18,510.42 = 7,445.28/x
3. Step 3: Cross multiply
   13,413.96x = 18,510.42 × 7,445.28
4. Step 4: Simplify right side
   13,413.96x = 137,815,259.82
5. Step 5: Solve for x
   x = 137,815,259.82/13,413.96
6. Step 6: Final answer
   x = 10,274.02