Finding the Fourth Proportional to 9,907.50, 13,672.41 and 5,431.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.50 : 13,672.41 = 5,431.26 : x
2. Step 2: Convert to fraction form
   9,907.50/13,672.41 = 5,431.26/x
3. Step 3: Cross multiply
   9,907.50x = 13,672.41 × 5,431.26
4. Step 4: Simplify right side
   9,907.50x = 74,258,413.54
5. Step 5: Solve for x
   x = 74,258,413.54/9,907.50
6. Step 6: Final answer
   x = 7,495.17