Finding the Fourth Proportional to 9,686.27, 13,368.47 and 5,439.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,686.27 : 13,368.47 = 5,439.09 : x
2. Step 2: Convert to fraction form
   9,686.27/13,368.47 = 5,439.09/x
3. Step 3: Cross multiply
   9,686.27x = 13,368.47 × 5,439.09
4. Step 4: Simplify right side
   9,686.27x = 72,712,284.30
5. Step 5: Solve for x
   x = 72,712,284.30/9,686.27
6. Step 6: Final answer
   x = 7,506.74