Finding the Fourth Proportional to 7,123.12, 9,830.04 and 3,979.32

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.12 : 9,830.04 = 3,979.32 : x
2. Step 2: Convert to fraction form
   7,123.12/9,830.04 = 3,979.32/x
3. Step 3: Cross multiply
   7,123.12x = 9,830.04 × 3,979.32
4. Step 4: Simplify right side
   7,123.12x = 39,116,874.77
5. Step 5: Solve for x
   x = 39,116,874.77/7,123.12
6. Step 6: Final answer
   x = 5,491.54