Finding the Fourth Proportional to 9,866.06, 13,615.17 and 5,389.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.06 : 13,615.17 = 5,389.88 : x
2. Step 2: Convert to fraction form
   9,866.06/13,615.17 = 5,389.88/x
3. Step 3: Cross multiply
   9,866.06x = 13,615.17 × 5,389.88
4. Step 4: Simplify right side
   9,866.06x = 73,384,166.52
5. Step 5: Solve for x
   x = 73,384,166.52/9,866.06
6. Step 6: Final answer
   x = 7,438.05