Finding the Fourth Proportional to 7,123.47, 9,830.42 and 3,979.71

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.47 : 9,830.42 = 3,979.71 : x
2. Step 2: Convert to fraction form
   7,123.47/9,830.42 = 3,979.71/x
3. Step 3: Cross multiply
   7,123.47x = 9,830.42 × 3,979.71
4. Step 4: Simplify right side
   7,123.47x = 39,122,200.88
5. Step 5: Solve for x
   x = 39,122,200.88/7,123.47
6. Step 6: Final answer
   x = 5,492.01