Finding the Fourth Proportional to 9,987.98, 14,980.55 and 3,413.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987.98 : 14,980.55 = 3,413.21 : x
2. Step 2: Convert to fraction form
   9,987.98/14,980.55 = 3,413.21/x
3. Step 3: Cross multiply
   9,987.98x = 14,980.55 × 3,413.21
4. Step 4: Simplify right side
   9,987.98x = 51,131,671.10
5. Step 5: Solve for x
   x = 51,131,671.10/9,987.98
6. Step 6: Final answer
   x = 5,119.32