Finding the Fourth Proportional to 6,724.50, 9,279.81 and 3,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,724.50 : 9,279.81 = 3,780.50 : x
2. Step 2: Convert to fraction form
   6,724.50/9,279.81 = 3,780.50/x
3. Step 3: Cross multiply
   6,724.50x = 9,279.81 × 3,780.50
4. Step 4: Simplify right side
   6,724.50x = 35,082,321.71
5. Step 5: Solve for x
   x = 35,082,321.71/6,724.50
6. Step 6: Final answer
   x = 5,217.09