Finding the Fourth Proportional to 9,689.16, 13,370.55 and 5,439.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,689.16 : 13,370.55 = 5,439.69 : x
2. Step 2: Convert to fraction form
   9,689.16/13,370.55 = 5,439.69/x
3. Step 3: Cross multiply
   9,689.16x = 13,370.55 × 5,439.69
4. Step 4: Simplify right side
   9,689.16x = 72,731,647.13
5. Step 5: Solve for x
   x = 72,731,647.13/9,689.16
6. Step 6: Final answer
   x = 7,506.50