Finding the Fourth Proportional to 105,109.50, 145,054.19 and 57,365.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,109.50 : 145,054.19 = 57,365.91 : x
2. Step 2: Convert to fraction form
   105,109.50/145,054.19 = 57,365.91/x
3. Step 3: Cross multiply
   105,109.50x = 145,054.19 × 57,365.91
4. Step 4: Simplify right side
   105,109.50x = 8,321,165,321.83
5. Step 5: Solve for x
   x = 8,321,165,321.83/105,109.50
6. Step 6: Final answer
   x = 79,166.63