Finding the Fourth Proportional to 105,843.28, 158,724.78 and 42,641.95

Step by Step Solution

1. Step 1: Write the proportion equation
   105,843.28 : 158,724.78 = 42,641.95 : x
2. Step 2: Convert to fraction form
   105,843.28/158,724.78 = 42,641.95/x
3. Step 3: Cross multiply
   105,843.28x = 158,724.78 × 42,641.95
4. Step 4: Simplify right side
   105,843.28x = 6,768,334,132.52
5. Step 5: Solve for x
   x = 6,768,334,132.52/105,843.28
6. Step 6: Final answer
   x = 63,946.75