Finding the Fourth Proportional to 105,879.60, 158,817.35 and 42,698.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,879.60 : 158,817.35 = 42,698.30 : x
2. Step 2: Convert to fraction form
   105,879.60/158,817.35 = 42,698.30/x
3. Step 3: Cross multiply
   105,879.60x = 158,817.35 × 42,698.30
4. Step 4: Simplify right side
   105,879.60x = 6,781,231,039.06
5. Step 5: Solve for x
   x = 6,781,231,039.06/105,879.60
6. Step 6: Final answer
   x = 64,046.63