Finding the Fourth Proportional to 9,866.52, 13,615.98 and 5,390.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.52 : 13,615.98 = 5,390.46 : x
2. Step 2: Convert to fraction form
   9,866.52/13,615.98 = 5,390.46/x
3. Step 3: Cross multiply
   9,866.52x = 13,615.98 × 5,390.46
4. Step 4: Simplify right side
   9,866.52x = 73,396,395.55
5. Step 5: Solve for x
   x = 73,396,395.55/9,866.52
6. Step 6: Final answer
   x = 7,438.93