Finding the Fourth Proportional to 105,866.57, 158,865.69 and 65,963.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,866.57 : 158,865.69 = 65,963.90 : x
2. Step 2: Convert to fraction form
   105,866.57/158,865.69 = 65,963.90/x
3. Step 3: Cross multiply
   105,866.57x = 158,865.69 × 65,963.90
4. Step 4: Simplify right side
   105,866.57x = 10,479,400,488.59
5. Step 5: Solve for x
   x = 10,479,400,488.59/105,866.57
6. Step 6: Final answer
   x = 98,986.87