Finding the Fourth Proportional to 105,391.86, 145,400.04 and 65,035.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,391.86 : 145,400.04 = 65,035.50 : x
2. Step 2: Convert to fraction form
   105,391.86/145,400.04 = 65,035.50/x
3. Step 3: Cross multiply
   105,391.86x = 145,400.04 × 65,035.50
4. Step 4: Simplify right side
   105,391.86x = 9,456,164,301.42
5. Step 5: Solve for x
   x = 9,456,164,301.42/105,391.86
6. Step 6: Final answer
   x = 89,723.86