Finding the Fourth Proportional to 105,109.18, 145,208.68 and 68,896.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105,109.18 : 145,208.68 = 68,896.55 : x
2. Step 2: Convert to fraction form
   105,109.18/145,208.68 = 68,896.55/x
3. Step 3: Cross multiply
   105,109.18x = 145,208.68 × 68,896.55
4. Step 4: Simplify right side
   105,109.18x = 10,004,377,272.83
5. Step 5: Solve for x
   x = 10,004,377,272.83/105,109.18
6. Step 6: Final answer
   x = 95,180.82