Finding the Fourth Proportional to 9,866.39, 13,615.07 and 5,389.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.39 : 13,615.07 = 5,389.25 : x
2. Step 2: Convert to fraction form
   9,866.39/13,615.07 = 5,389.25/x
3. Step 3: Cross multiply
   9,866.39x = 13,615.07 × 5,389.25
4. Step 4: Simplify right side
   9,866.39x = 73,374,920.98
5. Step 5: Solve for x
   x = 73,374,920.98/9,866.39
6. Step 6: Final answer
   x = 7,436.86