Finding the Fourth Proportional to 12,143.04, 18,216.72 and 5,222.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,143.04 : 18,216.72 = 5,222.40 : x
2. Step 2: Convert to fraction form
   12,143.04/18,216.72 = 5,222.40/x
3. Step 3: Cross multiply
   12,143.04x = 18,216.72 × 5,222.40
4. Step 4: Simplify right side
   12,143.04x = 95,134,998.53
5. Step 5: Solve for x
   x = 95,134,998.53/12,143.04
6. Step 6: Final answer
   x = 7,834.53