Finding the Fourth Proportional to 105,396.90, 145,523.79 and 65,165.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,396.90 : 145,523.79 = 65,165.82 : x
2. Step 2: Convert to fraction form
   105,396.90/145,523.79 = 65,165.82/x
3. Step 3: Cross multiply
   105,396.90x = 145,523.79 × 65,165.82
4. Step 4: Simplify right side
   105,396.90x = 9,483,177,104.86
5. Step 5: Solve for x
   x = 9,483,177,104.86/105,396.90
6. Step 6: Final answer
   x = 89,975.86