Finding the Fourth Proportional to 105,664.76, 145,832.33 and 65,391.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,664.76 : 145,832.33 = 65,391.50 : x
2. Step 2: Convert to fraction form
   105,664.76/145,832.33 = 65,391.50/x
3. Step 3: Cross multiply
   105,664.76x = 145,832.33 × 65,391.50
4. Step 4: Simplify right side
   105,664.76x = 9,536,193,751.08
5. Step 5: Solve for x
   x = 9,536,193,751.08/105,664.76
6. Step 6: Final answer
   x = 90,249.52