Finding the Fourth Proportional to 105,571.42, 145,633.35 and 65,272.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,571.42 : 145,633.35 = 65,272.30 : x
2. Step 2: Convert to fraction form
   105,571.42/145,633.35 = 65,272.30/x
3. Step 3: Cross multiply
   105,571.42x = 145,633.35 × 65,272.30
4. Step 4: Simplify right side
   105,571.42x = 9,505,823,711.21
5. Step 5: Solve for x
   x = 9,505,823,711.21/105,571.42
6. Step 6: Final answer
   x = 90,041.64