Finding the Fourth Proportional to 28,143.30, 42,222.63 and 9,426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,143.30 : 42,222.63 = 9,426.42 : x
2. Step 2: Convert to fraction form
   28,143.30/42,222.63 = 9,426.42/x
3. Step 3: Cross multiply
   28,143.30x = 42,222.63 × 9,426.42
4. Step 4: Simplify right side
   28,143.30x = 398,008,243.88
5. Step 5: Solve for x
   x = 398,008,243.88/28,143.30
6. Step 6: Final answer
   x = 14,142.20