Finding the Fourth Proportional to 7,321.31, 10,979.83 and 4,200.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.31 : 10,979.83 = 4,200.78 : x
2. Step 2: Convert to fraction form
   7,321.31/10,979.83 = 4,200.78/x
3. Step 3: Cross multiply
   7,321.31x = 10,979.83 × 4,200.78
4. Step 4: Simplify right side
   7,321.31x = 46,123,850.27
5. Step 5: Solve for x
   x = 46,123,850.27/7,321.31
6. Step 6: Final answer
   x = 6,299.94