Finding the Fourth Proportional to 105,697.28, 158,419.56 and 80,541.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105,697.28 : 158,419.56 = 80,541.92 : x
2. Step 2: Convert to fraction form
   105,697.28/158,419.56 = 80,541.92/x
3. Step 3: Cross multiply
   105,697.28x = 158,419.56 × 80,541.92
4. Step 4: Simplify right side
   105,697.28x = 12,759,415,527.96
5. Step 5: Solve for x
   x = 12,759,415,527.96/105,697.28
6. Step 6: Final answer
   x = 120,716.59