Finding the Fourth Proportional to 105,250.50, 145,363.41 and 81,663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,250.50 : 145,363.41 = 81,663.30 : x
2. Step 2: Convert to fraction form
   105,250.50/145,363.41 = 81,663.30/x
3. Step 3: Cross multiply
   105,250.50x = 145,363.41 × 81,663.30
4. Step 4: Simplify right side
   105,250.50x = 11,870,855,759.85
5. Step 5: Solve for x
   x = 11,870,855,759.85/105,250.50
6. Step 6: Final answer
   x = 112,786.69