Finding the Fourth Proportional to 105,099.67, 145,057.25 and 65,826.79

Step by Step Solution

1. Step 1: Write the proportion equation
   105,099.67 : 145,057.25 = 65,826.79 : x
2. Step 2: Convert to fraction form
   105,099.67/145,057.25 = 65,826.79/x
3. Step 3: Cross multiply
   105,099.67x = 145,057.25 × 65,826.79
4. Step 4: Simplify right side
   105,099.67x = 9,548,652,935.65
5. Step 5: Solve for x
   x = 9,548,652,935.65/105,099.67
6. Step 6: Final answer
   x = 90,853.31