Finding the Fourth Proportional to 105,441.92, 145,546.72 and 65,186.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,441.92 : 145,546.72 = 65,186.56 : x
2. Step 2: Convert to fraction form
   105,441.92/145,546.72 = 65,186.56/x
3. Step 3: Cross multiply
   105,441.92x = 145,546.72 × 65,186.56
4. Step 4: Simplify right side
   105,441.92x = 9,487,689,996.08
5. Step 5: Solve for x
   x = 9,487,689,996.08/105,441.92
6. Step 6: Final answer
   x = 89,980.25