Finding the Fourth Proportional to 9,866.82, 13,616.01 and 5,390.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.82 : 13,616.01 = 5,390.40 : x
2. Step 2: Convert to fraction form
   9,866.82/13,616.01 = 5,390.40/x
3. Step 3: Cross multiply
   9,866.82x = 13,616.01 × 5,390.40
4. Step 4: Simplify right side
   9,866.82x = 73,395,740.30
5. Step 5: Solve for x
   x = 73,395,740.30/9,866.82
6. Step 6: Final answer
   x = 7,438.64