Finding the Fourth Proportional to 13,700.72, 18,906.96 and 7,413.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,700.72 : 18,906.96 = 7,413.20 : x
2. Step 2: Convert to fraction form
   13,700.72/18,906.96 = 7,413.20/x
3. Step 3: Cross multiply
   13,700.72x = 18,906.96 × 7,413.20
4. Step 4: Simplify right side
   13,700.72x = 140,161,075.87
5. Step 5: Solve for x
   x = 140,161,075.87/13,700.72
6. Step 6: Final answer
   x = 10,230.20