Finding the Fourth Proportional to 7,145.96, 9,861.72 and 4,002.18

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.96 : 9,861.72 = 4,002.18 : x
2. Step 2: Convert to fraction form
   7,145.96/9,861.72 = 4,002.18/x
3. Step 3: Cross multiply
   7,145.96x = 9,861.72 × 4,002.18
4. Step 4: Simplify right side
   7,145.96x = 39,468,378.55
5. Step 5: Solve for x
   x = 39,468,378.55/7,145.96
6. Step 6: Final answer
   x = 5,523.17