Finding the Fourth Proportional to 105,456.96, 145,379.25 and 75,189.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,456.96 : 145,379.25 = 75,189.78 : x
2. Step 2: Convert to fraction form
   105,456.96/145,379.25 = 75,189.78/x
3. Step 3: Cross multiply
   105,456.96x = 145,379.25 × 75,189.78
4. Step 4: Simplify right side
   105,456.96x = 10,931,033,824.07
5. Step 5: Solve for x
   x = 10,931,033,824.07/105,456.96
6. Step 6: Final answer
   x = 103,653.98