Finding the Fourth Proportional to 105,662.20, 158,639.10 and 83,500.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,662.20 : 158,639.10 = 83,500.60 : x
2. Step 2: Convert to fraction form
   105,662.20/158,639.10 = 83,500.60/x
3. Step 3: Cross multiply
   105,662.20x = 158,639.10 × 83,500.60
4. Step 4: Simplify right side
   105,662.20x = 13,246,460,033.46
5. Step 5: Solve for x
   x = 13,246,460,033.46/105,662.20
6. Step 6: Final answer
   x = 125,366.12