Finding the Fourth Proportional to 7,123.20, 9,830.22 and 3,979.32

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.20 : 9,830.22 = 3,979.32 : x
2. Step 2: Convert to fraction form
   7,123.20/9,830.22 = 3,979.32/x
3. Step 3: Cross multiply
   7,123.20x = 9,830.22 × 3,979.32
4. Step 4: Simplify right side
   7,123.20x = 39,117,591.05
5. Step 5: Solve for x
   x = 39,117,591.05/7,123.20
6. Step 6: Final answer
   x = 5,491.58