Finding the Fourth Proportional to 15,413.46, 21,270.56 and 8,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,413.46 : 21,270.56 = 8,700.50 : x
2. Step 2: Convert to fraction form
   15,413.46/21,270.56 = 8,700.50/x
3. Step 3: Cross multiply
   15,413.46x = 21,270.56 × 8,700.50
4. Step 4: Simplify right side
   15,413.46x = 185,064,357.42
5. Step 5: Solve for x
   x = 185,064,357.42/15,413.46
6. Step 6: Final answer
   x = 12,006.67