Finding the Fourth Proportional to 105,661.05, 145,827.18 and 65,387.77

Step by Step Solution

1. Step 1: Write the proportion equation
   105,661.05 : 145,827.18 = 65,387.77 : x
2. Step 2: Convert to fraction form
   105,661.05/145,827.18 = 65,387.77/x
3. Step 3: Cross multiply
   105,661.05x = 145,827.18 × 65,387.77
4. Step 4: Simplify right side
   105,661.05x = 9,535,314,105.59
5. Step 5: Solve for x
   x = 9,535,314,105.59/105,661.05
6. Step 6: Final answer
   x = 90,244.36