Finding the Fourth Proportional to 7,123.34, 9,830.46 and 3,979.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.34 : 9,830.46 = 3,979.72 : x
2. Step 2: Convert to fraction form
   7,123.34/9,830.46 = 3,979.72/x
3. Step 3: Cross multiply
   7,123.34x = 9,830.46 × 3,979.72
4. Step 4: Simplify right side
   7,123.34x = 39,122,478.27
5. Step 5: Solve for x
   x = 39,122,478.27/7,123.34
6. Step 6: Final answer
   x = 5,492.15