Finding the Fourth Proportional to 7,142.65, 10,715.90 and 2,981.27

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.65 : 10,715.90 = 2,981.27 : x
2. Step 2: Convert to fraction form
   7,142.65/10,715.90 = 2,981.27/x
3. Step 3: Cross multiply
   7,142.65x = 10,715.90 × 2,981.27
4. Step 4: Simplify right side
   7,142.65x = 31,947,003.08
5. Step 5: Solve for x
   x = 31,947,003.08/7,142.65
6. Step 6: Final answer
   x = 4,472.71