Finding the Fourth Proportional to 9,639.15, 13,302.05 and 5,390.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.15 : 13,302.05 = 5,390.37 : x
2. Step 2: Convert to fraction form
   9,639.15/13,302.05 = 5,390.37/x
3. Step 3: Cross multiply
   9,639.15x = 13,302.05 × 5,390.37
4. Step 4: Simplify right side
   9,639.15x = 71,702,944.31
5. Step 5: Solve for x
   x = 71,702,944.31/9,639.15
6. Step 6: Final answer
   x = 7,438.72