Finding the Fourth Proportional to 7,142.20, 10,715.01 and 2,979.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.20 : 10,715.01 = 2,979.89 : x
2. Step 2: Convert to fraction form
   7,142.20/10,715.01 = 2,979.89/x
3. Step 3: Cross multiply
   7,142.20x = 10,715.01 × 2,979.89
4. Step 4: Simplify right side
   7,142.20x = 31,929,586.85
5. Step 5: Solve for x
   x = 31,929,586.85/7,142.20
6. Step 6: Final answer
   x = 4,470.56