Finding the Fourth Proportional to 105,571.17, 145,633.01 and 65,272.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,571.17 : 145,633.01 = 65,272.05 : x
2. Step 2: Convert to fraction form
   105,571.17/145,633.01 = 65,272.05/x
3. Step 3: Cross multiply
   105,571.17x = 145,633.01 × 65,272.05
4. Step 4: Simplify right side
   105,571.17x = 9,505,764,784.01
5. Step 5: Solve for x
   x = 9,505,764,784.01/105,571.17
6. Step 6: Final answer
   x = 90,041.29