Finding the Fourth Proportional to 7,123.62, 9,830.58 and 3,979.81

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.62 : 9,830.58 = 3,979.81 : x
2. Step 2: Convert to fraction form
   7,123.62/9,830.58 = 3,979.81/x
3. Step 3: Cross multiply
   7,123.62x = 9,830.58 × 3,979.81
4. Step 4: Simplify right side
   7,123.62x = 39,123,815.90
5. Step 5: Solve for x
   x = 39,123,815.90/7,123.62
6. Step 6: Final answer
   x = 5,492.12