Finding the Fourth Proportional to 10,603.98, 15,913.22 and 5,413.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,603.98 : 15,913.22 = 5,413.50 : x
2. Step 2: Convert to fraction form
   10,603.98/15,913.22 = 5,413.50/x
3. Step 3: Cross multiply
   10,603.98x = 15,913.22 × 5,413.50
4. Step 4: Simplify right side
   10,603.98x = 86,146,189.40
5. Step 5: Solve for x
   x = 86,146,189.40/10,603.98
6. Step 6: Final answer
   x = 8,123.95