Finding the Fourth Proportional to 105,960.72, 158,879.50 and 42,729.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,960.72 : 158,879.50 = 42,729.07 : x
2. Step 2: Convert to fraction form
   105,960.72/158,879.50 = 42,729.07/x
3. Step 3: Cross multiply
   105,960.72x = 158,879.50 × 42,729.07
4. Step 4: Simplify right side
   105,960.72x = 6,788,773,277.07
5. Step 5: Solve for x
   x = 6,788,773,277.07/105,960.72
6. Step 6: Final answer
   x = 64,068.77