Finding the Fourth Proportional to 105,682.47, 145,856.82 and 65,409.21

Step by Step Solution

1. Step 1: Write the proportion equation
   105,682.47 : 145,856.82 = 65,409.21 : x
2. Step 2: Convert to fraction form
   105,682.47/145,856.82 = 65,409.21/x
3. Step 3: Cross multiply
   105,682.47x = 145,856.82 × 65,409.21
4. Step 4: Simplify right side
   105,682.47x = 9,540,379,369.31
5. Step 5: Solve for x
   x = 9,540,379,369.31/105,682.47
6. Step 6: Final answer
   x = 90,274.00