Finding the Fourth Proportional to 144,769.93, 199,790.72 and 81,128.23

Step by Step Solution

1. Step 1: Write the proportion equation
   144,769.93 : 199,790.72 = 81,128.23 : x
2. Step 2: Convert to fraction form
   144,769.93/199,790.72 = 81,128.23/x
3. Step 3: Cross multiply
   144,769.93x = 199,790.72 × 81,128.23
4. Step 4: Simplify right side
   144,769.93x = 16,208,667,484.03
5. Step 5: Solve for x
   x = 16,208,667,484.03/144,769.93
6. Step 6: Final answer
   x = 111,961.56