Finding the Fourth Proportional to 7,145.72, 9,861.09 and 4,351.22

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.72 : 9,861.09 = 4,351.22 : x
2. Step 2: Convert to fraction form
   7,145.72/9,861.09 = 4,351.22/x
3. Step 3: Cross multiply
   7,145.72x = 9,861.09 × 4,351.22
4. Step 4: Simplify right side
   7,145.72x = 42,907,767.86
5. Step 5: Solve for x
   x = 42,907,767.86/7,145.72
6. Step 6: Final answer
   x = 6,004.68