Finding the Fourth Proportional to 12,288.67, 18,428.31 and 3,967.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.67 : 18,428.31 = 3,967.43 : x
2. Step 2: Convert to fraction form
   12,288.67/18,428.31 = 3,967.43/x
3. Step 3: Cross multiply
   12,288.67x = 18,428.31 × 3,967.43
4. Step 4: Simplify right side
   12,288.67x = 73,112,937.80
5. Step 5: Solve for x
   x = 73,112,937.80/12,288.67
6. Step 6: Final answer
   x = 5,949.62