Finding the Fourth Proportional to 105,315.20, 158,019.60 and 55,383.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,315.20 : 158,019.60 = 55,383.20 : x
2. Step 2: Convert to fraction form
   105,315.20/158,019.60 = 55,383.20/x
3. Step 3: Cross multiply
   105,315.20x = 158,019.60 × 55,383.20
4. Step 4: Simplify right side
   105,315.20x = 8,751,631,110.72
5. Step 5: Solve for x
   x = 8,751,631,110.72/105,315.20
6. Step 6: Final answer
   x = 83,099.41