Finding the Fourth Proportional to 143,105.39, 197,477.72 and 79,439.09

Step by Step Solution

1. Step 1: Write the proportion equation
   143,105.39 : 197,477.72 = 79,439.09 : x
2. Step 2: Convert to fraction form
   143,105.39/197,477.72 = 79,439.09/x
3. Step 3: Cross multiply
   143,105.39x = 197,477.72 × 79,439.09
4. Step 4: Simplify right side
   143,105.39x = 15,687,448,987.49
5. Step 5: Solve for x
   x = 15,687,448,987.49/143,105.39
6. Step 6: Final answer
   x = 109,621.65