Finding the Fourth Proportional to 105,667.47, 145,960.86 and 78,763.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,667.47 : 145,960.86 = 78,763.28 : x
2. Step 2: Convert to fraction form
   105,667.47/145,960.86 = 78,763.28/x
3. Step 3: Cross multiply
   105,667.47x = 145,960.86 × 78,763.28
4. Step 4: Simplify right side
   105,667.47x = 11,496,355,355.42
5. Step 5: Solve for x
   x = 11,496,355,355.42/105,667.47
6. Step 6: Final answer
   x = 108,797.49