Finding the Fourth Proportional to 105,109, 145,053.48 and 57,365.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,109 : 145,053.48 = 57,365.40 : x
2. Step 2: Convert to fraction form
   105,109/145,053.48 = 57,365.40/x
3. Step 3: Cross multiply
   105,109x = 145,053.48 × 57,365.40
4. Step 4: Simplify right side
   105,109x = 8,321,050,901.59
5. Step 5: Solve for x
   x = 8,321,050,901.59/105,109
6. Step 6: Final answer
   x = 79,165.92