Finding the Fourth Proportional to 105,820.54, 158,729.06 and 42,639.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,820.54 : 158,729.06 = 42,639.12 : x
2. Step 2: Convert to fraction form
   105,820.54/158,729.06 = 42,639.12/x
3. Step 3: Cross multiply
   105,820.54x = 158,729.06 × 42,639.12
4. Step 4: Simplify right side
   105,820.54x = 6,768,067,543.43
5. Step 5: Solve for x
   x = 6,768,067,543.43/105,820.54
6. Step 6: Final answer
   x = 63,957.98