Finding the Fourth Proportional to 143,005.05, 197,298.09 and 81,707.26

Step by Step Solution

1. Step 1: Write the proportion equation
   143,005.05 : 197,298.09 = 81,707.26 : x
2. Step 2: Convert to fraction form
   143,005.05/197,298.09 = 81,707.26/x
3. Step 3: Cross multiply
   143,005.05x = 197,298.09 × 81,707.26
4. Step 4: Simplify right side
   143,005.05x = 16,120,685,843.89
5. Step 5: Solve for x
   x = 16,120,685,843.89/143,005.05
6. Step 6: Final answer
   x = 112,728.09