Finding the Fourth Proportional to 105,965.32, 158,928.81 and 42,782.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,965.32 : 158,928.81 = 42,782.80 : x
2. Step 2: Convert to fraction form
   105,965.32/158,928.81 = 42,782.80/x
3. Step 3: Cross multiply
   105,965.32x = 158,928.81 × 42,782.80
4. Step 4: Simplify right side
   105,965.32x = 6,799,419,492.47
5. Step 5: Solve for x
   x = 6,799,419,492.47/105,965.32
6. Step 6: Final answer
   x = 64,166.46