Finding the Fourth Proportional to 9,867.74, 13,617.50 and 5,391.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,867.74 : 13,617.50 = 5,391.59 : x
2. Step 2: Convert to fraction form
   9,867.74/13,617.50 = 5,391.59/x
3. Step 3: Cross multiply
   9,867.74x = 13,617.50 × 5,391.59
4. Step 4: Simplify right side
   9,867.74x = 73,419,881.78
5. Step 5: Solve for x
   x = 73,419,881.78/9,867.74
6. Step 6: Final answer
   x = 7,440.40