Finding the Fourth Proportional to 9,867.10, 13,616.32 and 5,390.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,867.10 : 13,616.32 = 5,390.62 : x
2. Step 2: Convert to fraction form
   9,867.10/13,616.32 = 5,390.62/x
3. Step 3: Cross multiply
   9,867.10x = 13,616.32 × 5,390.62
4. Step 4: Simplify right side
   9,867.10x = 73,400,406.92
5. Step 5: Solve for x
   x = 73,400,406.92/9,867.10
6. Step 6: Final answer
   x = 7,438.90