Finding the Fourth Proportional to 143,222.12, 214,629.50 and 105,485.43

Step by Step Solution

1. Step 1: Write the proportion equation
   143,222.12 : 214,629.50 = 105,485.43 : x
2. Step 2: Convert to fraction form
   143,222.12/214,629.50 = 105,485.43/x
3. Step 3: Cross multiply
   143,222.12x = 214,629.50 × 105,485.43
4. Step 4: Simplify right side
   143,222.12x = 22,640,284,570.76
5. Step 5: Solve for x
   x = 22,640,284,570.76/143,222.12
6. Step 6: Final answer
   x = 158,078.13