Finding the Fourth Proportional to 11,413.74, 15,636.51 and 10,987.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,413.74 : 15,636.51 = 10,987.30 : x
2. Step 2: Convert to fraction form
   11,413.74/15,636.51 = 10,987.30/x
3. Step 3: Cross multiply
   11,413.74x = 15,636.51 × 10,987.30
4. Step 4: Simplify right side
   11,413.74x = 171,803,026.32
5. Step 5: Solve for x
   x = 171,803,026.32/11,413.74
6. Step 6: Final answer
   x = 15,052.30