Finding the Fourth Proportional to 9,868.64, 13,618.17 and 5,391.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,868.64 : 13,618.17 = 5,391.50 : x
2. Step 2: Convert to fraction form
   9,868.64/13,618.17 = 5,391.50/x
3. Step 3: Cross multiply
   9,868.64x = 13,618.17 × 5,391.50
4. Step 4: Simplify right side
   9,868.64x = 73,422,295.46
5. Step 5: Solve for x
   x = 73,422,295.46/9,868.64
6. Step 6: Final answer
   x = 7,439.96