Finding the Fourth Proportional to 7,081.20, 9,783.72 and 5,318.64

Step by Step Solution

1. Step 1: Write the proportion equation
   7,081.20 : 9,783.72 = 5,318.64 : x
2. Step 2: Convert to fraction form
   7,081.20/9,783.72 = 5,318.64/x
3. Step 3: Cross multiply
   7,081.20x = 9,783.72 × 5,318.64
4. Step 4: Simplify right side
   7,081.20x = 52,036,084.54
5. Step 5: Solve for x
   x = 52,036,084.54/7,081.20
6. Step 6: Final answer
   x = 7,348.48