Finding the Fourth Proportional to 105,959.72, 158,878.01 and 42,728.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,959.72 : 158,878.01 = 42,728.07 : x
2. Step 2: Convert to fraction form
   105,959.72/158,878.01 = 42,728.07/x
3. Step 3: Cross multiply
   105,959.72x = 158,878.01 × 42,728.07
4. Step 4: Simplify right side
   105,959.72x = 6,788,550,519.10
5. Step 5: Solve for x
   x = 6,788,550,519.10/105,959.72
6. Step 6: Final answer
   x = 64,067.28