Finding the Fourth Proportional to 105,309.31, 145,306.69 and 59,986.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,309.31 : 145,306.69 = 59,986.30 : x
2. Step 2: Convert to fraction form
   105,309.31/145,306.69 = 59,986.30/x
3. Step 3: Cross multiply
   105,309.31x = 145,306.69 × 59,986.30
4. Step 4: Simplify right side
   105,309.31x = 8,716,410,185.11
5. Step 5: Solve for x
   x = 8,716,410,185.11/105,309.31
6. Step 6: Final answer
   x = 82,769.61