Finding the Fourth Proportional to 105,662.76, 145,829.56 and 65,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,662.76 : 145,829.56 = 65,389.50 : x
2. Step 2: Convert to fraction form
   105,662.76/145,829.56 = 65,389.50/x
3. Step 3: Cross multiply
   105,662.76x = 145,829.56 × 65,389.50
4. Step 4: Simplify right side
   105,662.76x = 9,535,722,013.62
5. Step 5: Solve for x
   x = 9,535,722,013.62/105,662.76
6. Step 6: Final answer
   x = 90,246.76