Finding the Fourth Proportional to 143,581.97, 198,139.72 and 79,918.40

Step by Step Solution

1. Step 1: Write the proportion equation
   143,581.97 : 198,139.72 = 79,918.40 : x
2. Step 2: Convert to fraction form
   143,581.97/198,139.72 = 79,918.40/x
3. Step 3: Cross multiply
   143,581.97x = 198,139.72 × 79,918.40
4. Step 4: Simplify right side
   143,581.97x = 15,835,008,729.71
5. Step 5: Solve for x
   x = 15,835,008,729.71/143,581.97
6. Step 6: Final answer
   x = 110,285.50